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    • Mating Behaviour
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Slow motion clip of a group of male Mallards (Anas platyrhynchos) competing violently to mate with a single female, Cornwall, England, UK, May 2018.
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Morley Read / Slow motion clip of a group of male Mallards (Anas platyrhynchos) competing violently to mate with a single female, Cornwall, England, UK, May 2018.
Yellowtail tang (Zebrasoma xanthurum) male and female turn belly to belly during spawning to ensure fertilization. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea. This action is very fast...
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Alex Mustard / Yellowtail tang (Zebrasoma xanthurum) male and female turn belly to belly during spawning to ensure fertilization. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea. This action is very fast...
Sonoran desert toad (Incilius alvarius) pair mating, with trail of spawn in water. Arizona, USA.
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John Cancalosi / Sonoran desert toad (Incilius alvarius) pair mating, with trail of spawn in water. Arizona, USA.
Humphead parrotfish (Bolbometopon muricatum) shoal spawning in early morning, part of mass aggregation of thousands of fish. Caroline Islands, Palau.
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Tony Wu / Humphead parrotfish (Bolbometopon muricatum) shoal spawning in early morning, part of mass aggregation of thousands of fish. Caroline Islands, Palau.
Common European adder (Vipera berus) two males fighting over a female. Holt, North Norfolk, England, UK. April
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David Tipling / Common European adder (Vipera berus) two males fighting over a female. Holt, North Norfolk, England, UK. April
Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April
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David Tipling / Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April
Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April.
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David Tipling / Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April.
Red deer (Cervus elaphus) stag roaring, silhouetted  under trees at sunrise. Bushy Park, London, UK. September
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Oscar Dewhurst / Red deer (Cervus elaphus) stag roaring, silhouetted under trees at sunrise. Bushy Park, London, UK. September
Pair of Western clown anemonefish (Amphiprion ocellaris) spawning orange eggs on the rock beneath their Magnificent sea anemone (Heteractis magnifica) home on a coral reef. This photo shows the larger...
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Alex Mustard / Pair of Western clown anemonefish (Amphiprion ocellaris) spawning orange eggs on the rock beneath their Magnificent sea anemone (Heteractis magnifica) home on a coral reef. This photo shows the larger...
Crenulated fiddler crab (Uca crenulata) waving its major claw at another crab, part of a courtship display, Southern California, USA, June.
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John Chan / Crenulated fiddler crab (Uca crenulata) waving its major claw at another crab, part of a courtship display, Southern California, USA, June.
Great frigatebird (Phaethon aethereus) male at nest site, with gular sac inflated to attract females. Genovesa Island, Galapagos, May.
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John Shaw / Great frigatebird (Phaethon aethereus) male at nest site, with gular sac inflated to attract females. Genovesa Island, Galapagos, May.
Common grackle pair (Quiscalus quiscula) in courtship display. Wakodahatchee Wetlands, Florida, USA, April.
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John Shaw / Common grackle pair (Quiscalus quiscula) in courtship display. Wakodahatchee Wetlands, Florida, USA, April.
Black-browed albatross pair (Thalassarche melanophris) mutual grooming during copulation. New Island, Falkland Islands, November.
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John Shaw / Black-browed albatross pair (Thalassarche melanophris) mutual grooming during copulation. New Island, Falkland Islands, November.
Elkhorn corals (Acropora palmata) at night silhouetted by a scientist's light during the annual coral spawn. Abaco, Bahamas.
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Shane Gross / Elkhorn corals (Acropora palmata) at night silhouetted by a scientist's light during the annual coral spawn. Abaco, Bahamas.
Seven spot ladybird (Coccinella septempunctata) pair mating on Mayweed (Anthemis sp) flower. Cyprus. April.
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Edwin Giesbers / Seven spot ladybird (Coccinella septempunctata) pair mating on Mayweed (Anthemis sp) flower. Cyprus. April.
Seven spot ladybird (Coccinella septempunctata) pair mating on Mayweed (Anthemis sp) flower. Cyprus. April.
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Edwin Giesbers / Seven spot ladybird (Coccinella septempunctata) pair mating on Mayweed (Anthemis sp) flower. Cyprus. April.
Chum salmon (Oncorhynchus keta) migrate up a small river near Bella Bella, British Columbia, Canada. September
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Nick Hawkins / Chum salmon (Oncorhynchus keta) migrate up a small river near Bella Bella, British Columbia, Canada. September
Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...
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John Chan / Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...
RF - Brown hare, (Lepus europaeus) male pursuing female that is in season, Islay, Scotland, UK., March (This image may be licensed either as rights managed or royalty free.)
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SCOTLAND: The Big Picture / RF - Brown hare, (Lepus europaeus) male pursuing female that is in season, Islay, Scotland, UK., March (This image may be licensed either as rights managed or royalty free.)
RF - Brown hare, (Lepus europaeus), male and female displaying courtship behaviour, Islay, Scotland, UK., March (This image may be licensed either as rights managed or royalty free.)
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SCOTLAND: The Big Picture / RF - Brown hare, (Lepus europaeus), male and female displaying courtship behaviour, Islay, Scotland, UK., March (This image may be licensed either as rights managed or royalty free.)
RF - Black Grouse (Tetrao tetrix), two males fighting on lek , Scotland, UK.April (This image may be licensed either as rights managed or royalty free.)
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SCOTLAND: The Big Picture / RF - Black Grouse (Tetrao tetrix), two males fighting on lek , Scotland, UK.April (This image may be licensed either as rights managed or royalty free.)
Brown hare, (Lepus europaeus), group of animals in field, Islay, Scotland, UK., March
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SCOTLAND: The Big Picture / Brown hare, (Lepus europaeus), group of animals in field, Islay, Scotland, UK., March
Sarus crane (Grus antigone), male displaying, Keoladeo NP, Bharatpur, India
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Bernard Castelein / Sarus crane (Grus antigone), male displaying, Keoladeo NP, Bharatpur, India
Aerial shot of Killer whales (Orcinus orca) near the surface, showing mating behaviour including a male Killer whale displaying penis, Troms, Norway, August.
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Espen Bergersen / Aerial shot of Killer whales (Orcinus orca) near the surface, showing mating behaviour including a male Killer whale displaying penis, Troms, Norway, August.
Aerial shot of Killer whales (Orcinus orca) near the surface, showing mating behaviour, Troms, Norway, August.
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Espen Bergersen / Aerial shot of Killer whales (Orcinus orca) near the surface, showing mating behaviour, Troms, Norway, August.
King penguins (Aptenodytes patagonicus) at sunrise. Two males and a female, with the males fighting for the attention of the female. Falklands Islands. 2018 Wildlife Photographer of the Year LUMIX Peo...
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Wim van den Heever / King penguins (Aptenodytes patagonicus) at sunrise. Two males and a female, with the males fighting for the attention of the female. Falklands Islands. 2018 Wildlife Photographer of the Year LUMIX Peo...
Western Grebe (Aechmorphus occidentalis), pair during 'rushing' courtship display in which they run across water's surface in synchrony, near Escondido, California, USA, January.
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Marie Read / Western Grebe (Aechmorphus occidentalis), pair during 'rushing' courtship display in which they run across water's surface in synchrony, near Escondido, California, USA, January.
Black-necked stilts (Himantopus mexicanus) pair performing post-copulatory display (as copulation ends, the male slides off the female leaving his wings draped over her and crossing his bill with hers...
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Marie Read / Black-necked stilts (Himantopus mexicanus) pair performing post-copulatory display (as copulation ends, the male slides off the female leaving his wings draped over her and crossing his bill with hers...
Great crested grebe (Podiceps cristatus) adults courting and greeting each other to confirm their bond. Even with the young chicks already out they often show courtship behavior to each other, Valkenh...
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David Pattyn / Great crested grebe (Podiceps cristatus) adults courting and greeting each other to confirm their bond. Even with the young chicks already out they often show courtship behavior to each other, Valkenh...
Mandarin duck drake (Aix galericulata) on the water, showing orange 'sail' feathers which are used when displaying, Southwest London, UK, March.
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Russell Cooper / Mandarin duck drake (Aix galericulata) on the water, showing orange 'sail' feathers which are used when displaying, Southwest London, UK, March.
Adelie penguin (Pygoscelis adeliae) calling during courtship, Atka Bay, Queen Maud Land, Antarctica, December.
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Stefan Christmann / Adelie penguin (Pygoscelis adeliae) calling during courtship, Atka Bay, Queen Maud Land, Antarctica, December.
Cameratrap video of a male Superb lyrebird (Menura novaehollandiae) courting female on display mound, Australia, July.
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David Gallan / Cameratrap video of a male Superb lyrebird (Menura novaehollandiae) courting female on display mound, Australia, July.
Male Satin bowerbird (Ptilonorhynchus violaceus) courting female on suburban street verge, bower filled with blue plastic, Australia, October 2018.
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David Gallan / Male Satin bowerbird (Ptilonorhynchus violaceus) courting female on suburban street verge, bower filled with blue plastic, Australia, October 2018.
Lioness (Panthera leo), aggressively rebuffing male lion banks of the Luangwa river, South Luangwa National Park, Zambia
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Eric Baccega / Lioness (Panthera leo), aggressively rebuffing male lion banks of the Luangwa river, South Luangwa National Park, Zambia
Pair of White storks (Ciconia ciconia) mating on their nest, Knepp Castle Estate, Sussex, England, UK, April. This is the first recorded instance of White storks nesting in the UK for several hundreds...
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Nick Upton / Pair of White storks (Ciconia ciconia) mating on their nest, Knepp Castle Estate, Sussex, England, UK, April. This is the first recorded instance of White storks nesting in the UK for several hundreds...
Male California least tern (Sternula antillarum browni) presenting fish offering to female during mating, Huntington Beach, California, USA, May.
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John Chan / Male California least tern (Sternula antillarum browni) presenting fish offering to female during mating, Huntington Beach, California, USA, May.
Elegant terns (Thalasseus elegans) courting, Southern California, USA, March.
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John Chan / Elegant terns (Thalasseus elegans) courting, Southern California, USA, March.
Pair of Marsh fritillary butterflies (Euphydryas aurinia) courting on a Buttercup (Ranunculus), Devon, England, UK, June.
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Michael Hutchinson / Pair of Marsh fritillary butterflies (Euphydryas aurinia) courting on a Buttercup (Ranunculus), Devon, England, UK, June.
Pair of Marsh fritillary butterflies (Euphydryas aurinia) courting on a Buttercup (Ranunculus), Devon, England, UK, June.
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Michael Hutchinson / Pair of Marsh fritillary butterflies (Euphydryas aurinia) courting on a Buttercup (Ranunculus), Devon, England, UK, June.
Pair of Marsh fritillary butterflies (Euphydryas aurinia) mating, Devon, England, UK, June.
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Michael Hutchinson / Pair of Marsh fritillary butterflies (Euphydryas aurinia) mating, Devon, England, UK, June.
Close-up of a pair of Marsh fritillary butterflies (Euphydryas aurinia) mating, showing tips of abdomens, Devon, England, UK, June.
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Michael Hutchinson / Close-up of a pair of Marsh fritillary butterflies (Euphydryas aurinia) mating, showing tips of abdomens, Devon, England, UK, June.
Close-up of a pair of Marsh fritillary butterflies (Euphydryas aurinia) mating, shot tilt downs, Devon, England, UK, June.
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Michael Hutchinson / Close-up of a pair of Marsh fritillary butterflies (Euphydryas aurinia) mating, shot tilt downs, Devon, England, UK, June.
White stork (Ciconia ciconia) pair mating on their nest at sunset, Knepp estate, Sussex, UK, April 2019. This is the first recorded instance of White storks nesting in the UK for several hundreds of y...
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Nick Upton / White stork (Ciconia ciconia) pair mating on their nest at sunset, Knepp estate, Sussex, UK, April 2019. This is the first recorded instance of White storks nesting in the UK for several hundreds of y...
White stork (Ciconia ciconia) pair performing an up-down display with bill clattering on their nest in an Oak tree, Knepp estate, Sussex, UK, April 2019. This is the first recorded instance of White s...
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Nick Upton / White stork (Ciconia ciconia) pair performing an up-down display with bill clattering on their nest in an Oak tree, Knepp estate, Sussex, UK, April 2019. This is the first recorded instance of White s...
Emperor penguin (Aptenodytes forsteri), pair mating. Atka Bay, Antarctica. May.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri), pair mating. Atka Bay, Antarctica. May.
Emperor penguin (Aptenodytes forsteri) pair in courtship, on sea ice. Atka Bay, Antarctica. May.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) pair in courtship, on sea ice. Atka Bay, Antarctica. May.
Emperor penguin (Aptenodytes forsteri) pair mating. Atka Bay, Antarctica. May. Sequence 3/4.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) pair mating. Atka Bay, Antarctica. May. Sequence 3/4.
Emperor penguin (Aptenodytes forsteri) pair mating on sea ice. Atka Bay, Antarctica. May.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) pair mating on sea ice. Atka Bay, Antarctica. May.
Ivy bee (Colletes hederae) mating ball, showing a mass of males clustered around a female recently emerged from her burrow, Wiltshire, England, UK, September.
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Nick Upton / Ivy bee (Colletes hederae) mating ball, showing a mass of males clustered around a female recently emerged from her burrow, Wiltshire, England, UK, September.
American toads (Anaxyrus americanus), several males competing to mate with female, Maryland, USA, April.
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John Cancalosi / American toads (Anaxyrus americanus), several males competing to mate with female, Maryland, USA, April.
Red deer (Cervus elaphus) herd during rut in morning light. Derbyshire, England, UK. October.
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Paul Hobson / Red deer (Cervus elaphus) herd during rut in morning light. Derbyshire, England, UK. October.
Tracking shot of a male Pheasant (Phasianus colchicus) displaying to an unreceptive female, Barcelona, Spain, May.
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David Perpinan / Tracking shot of a male Pheasant (Phasianus colchicus) displaying to an unreceptive female, Barcelona, Spain, May.
American toads (Anaxyrus americanus), several males competing to mate with female, Maryland, USA, April.
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John Cancalosi / American toads (Anaxyrus americanus), several males competing to mate with female, Maryland, USA, April.
Nurse sharks (Ginglymostoma cirratum) two in a courtship dance at sunrise in a mangrove area near Eleuthera, Bahamas.
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Shane Gross / Nurse sharks (Ginglymostoma cirratum) two in a courtship dance at sunrise in a mangrove area near Eleuthera, Bahamas.
Great bowerbird (Chlamydera nuchalis), male showing off treasures whilst female inspects bower. Lake Argyle, Kununurra, Western Australia.
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Steven David Miller / Great bowerbird (Chlamydera nuchalis), male showing off treasures whilst female inspects bower. Lake Argyle, Kununurra, Western Australia.
Male Common european toad (Bufo bufo) in amplexus with a dead fish, Lower Saxony, Germany, April.
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Kerstin Hinze / Male Common european toad (Bufo bufo) in amplexus with a dead fish, Lower Saxony, Germany, April.
Sperm whale (Physeter macrocephalus) young male trying to copulate with a female. The calf of the female was in the way so the male is trying to chase it away. Dominica.
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Franco Banfi / Sperm whale (Physeter macrocephalus) young male trying to copulate with a female. The calf of the female was in the way so the male is trying to chase it away. Dominica.
Alcedo giant tortoise (Chelonoidis vandenburghi) pair mating in shallow pool, with two others resting nearby. Alcedo Volcano, Isabela Island, Galapagos
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Tui De Roy / Alcedo giant tortoise (Chelonoidis vandenburghi) pair mating in shallow pool, with two others resting nearby. Alcedo Volcano, Isabela Island, Galapagos
Blue-footed booby (Sula nebouxii), pair in courtship display. Punta Pitt, San Cristobal Island, Galapagos. April 2017.
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Tui De Roy / Blue-footed booby (Sula nebouxii), pair in courtship display. Punta Pitt, San Cristobal Island, Galapagos. April 2017.
Yellowtail tang (Zebrasoma xanthurum) male courting a female prior to spawning at dusk on a coral reef. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea.
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Alex Mustard / Yellowtail tang (Zebrasoma xanthurum) male courting a female prior to spawning at dusk on a coral reef. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea.
Pair of Waved albatrosses (Phoebastria irrorata) displaying, tapping beaks,  Galapagos Islands, Ecuador.
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Sandesh Kadur / Pair of Waved albatrosses (Phoebastria irrorata) displaying, tapping beaks, Galapagos Islands, Ecuador.
Andean cock-of-the-rock (Rupicola peruvianus), male displaying at lek in tree. Manu Biosphere Reserve, Amazonia, Peru.
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Nick Garbutt / Andean cock-of-the-rock (Rupicola peruvianus), male displaying at lek in tree. Manu Biosphere Reserve, Amazonia, Peru.
Group of Barbels (Barbus barbus) spawning, River Rhone, Rhone-Alpes, France, April.
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Remi Masson / Group of Barbels (Barbus barbus) spawning, River Rhone, Rhone-Alpes, France, April.
Common toads (Bufo bufo) mating surrounded by strings of toadspawn. Ain, Alps, France. First prize in the  category "The Underwater World, GDT European Wildlife Photographer of the Year 2014 competiti...
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Remi Masson / Common toads (Bufo bufo) mating surrounded by strings of toadspawn. Ain, Alps, France. First prize in the category "The Underwater World, GDT European Wildlife Photographer of the Year 2014 competiti...
Pair of Pumpkinseeds (Lepomis gibbosus) mating, male chasing other individuals away, River Rhone, Rhone-Alpes, France, June.
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Remi Masson / Pair of Pumpkinseeds (Lepomis gibbosus) mating, male chasing other individuals away, River Rhone, Rhone-Alpes, France, June.
Male Common toads (Bufo bufo) fighting underwater during mating season, with a pair mating Ain, Rhone-Alps, France, March.
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Remi Masson / Male Common toads (Bufo bufo) fighting underwater during mating season, with a pair mating Ain, Rhone-Alps, France, March.
Group of Nase (Chondrostoma nasus) and Barbels (Barbus barbus) spawning, River Rhone, Rhone-Alpes, France, April.
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Remi Masson / Group of Nase (Chondrostoma nasus) and Barbels (Barbus barbus) spawning, River Rhone, Rhone-Alpes, France, April.
Shoal of Nase (Chondrostoma nasus) spawning, River Ain, Rhone-Alpes, France, April.
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Remi Masson / Shoal of Nase (Chondrostoma nasus) spawning, River Ain, Rhone-Alpes, France, April.
Pair of European nuthatches (Sitta europaea) mating, Bavaria, Germany, April.
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Konrad Wothe / Pair of European nuthatches (Sitta europaea) mating, Bavaria, Germany, April.
Male California Least Tern (Sternula antillarum browni) courting a female, presenting a fish before chasing off another male, Huntington Beach, California, USA, May.
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John Chan / Male California Least Tern (Sternula antillarum browni) courting a female, presenting a fish before chasing off another male, Huntington Beach, California, USA, May.
Wide-angle shot of a pair of Common European toads (Bufo bufo) in amplexus, jumping into a pond, Priddy, Somerset, England, UK, April.
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John Waters / Wide-angle shot of a pair of Common European toads (Bufo bufo) in amplexus, jumping into a pond, Priddy, Somerset, England, UK, April.
Black Grouse (Tetrao tetrix) males fighting at lek in the snow, Tver, Russia. April
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Sergey Gorshkov / Black Grouse (Tetrao tetrix) males fighting at lek in the snow, Tver, Russia. April
Male Shoveler (Anas clypeata) chasing other males away from his mate, Greyale RSPB Reserve, Somerset Levels, England, UK, February.
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John Waters / Male Shoveler (Anas clypeata) chasing other males away from his mate, Greyale RSPB Reserve, Somerset Levels, England, UK, February.
Edible frog (Pelophylax k. esculentus) catching a common blue damselfly (Enallagma cyathigerum) with its tongue with pair mating on stem above, Hondenven, Tubbergen, The Netherlands, July.
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Theo Bosboom / Edible frog (Pelophylax k. esculentus) catching a common blue damselfly (Enallagma cyathigerum) with its tongue with pair mating on stem above, Hondenven, Tubbergen, The Netherlands, July.
Large group of Common blue damselflies (Enallagma cyathigerum) including mating couples - on stems of grass, Hondenven, Tubbergen, The Netherlands. June.
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Theo Bosboom / Large group of Common blue damselflies (Enallagma cyathigerum) including mating couples - on stems of grass, Hondenven, Tubbergen, The Netherlands. June.
Banded demoiselles  (Calopteryx splendens) pair still clasped together after mating, with two males resting nearby, the Netherlands, July.
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Theo Bosboom / Banded demoiselles (Calopteryx splendens) pair still clasped together after mating, with two males resting nearby, the Netherlands, July.
Common blue damselfly (Enallagma cyathigerum) male trying to interfere with a mating couple.  Hondenven, Tubbergen, the Netherlands, June.
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Theo Bosboom / Common blue damselfly (Enallagma cyathigerum) male trying to interfere with a mating couple. Hondenven, Tubbergen, the Netherlands, June.
Variable damselfly (Coenagrion pulchellum) pair mating, De Peel National Park, the Netherlands, July.
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Theo Bosboom / Variable damselfly (Coenagrion pulchellum) pair mating, De Peel National Park, the Netherlands, July.
Short tailed albatross (Phoebastria albatrus) subadults courting, one with fish-hook and monofilament line embedded in throat. Tsubamezaki, Torishima Island, Japan. December.
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Tui De Roy / Short tailed albatross (Phoebastria albatrus) subadults courting, one with fish-hook and monofilament line embedded in throat. Tsubamezaki, Torishima Island, Japan. December.
Kottigehar dancing frog (Micrixalus kottigeharensis) male calling  and displaying to attract female by waving foot, Agumbe, Western Ghats, India.
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Yashpal Rathore / Kottigehar dancing frog (Micrixalus kottigeharensis) male calling and displaying to attract female by waving foot, Agumbe, Western Ghats, India.
Kottigehar dancing frog (Micrixalus kottigeharensis) male calling  and displaying to attract female by waving foot, Agumbe, Western Ghats, India.
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Yashpal Rathore / Kottigehar dancing frog (Micrixalus kottigeharensis) male calling and displaying to attract female by waving foot, Agumbe, Western Ghats, India.
Pair of Black-tailed godwits (Limosa limosa) courting and mating in wetland, Belgium, April
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Philippe Clement / Pair of Black-tailed godwits (Limosa limosa) courting and mating in wetland, Belgium, April
Atlantic salmon (Salmo salar) migrating upstream to spawn, Quebec, Canada  Photographed for the Freshwater Project.
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Michel Roggo / Atlantic salmon (Salmo salar) migrating upstream to spawn, Quebec, Canada Photographed for the Freshwater Project.
Waved albatross (Phoebastria irrorata) pair in courtship display at nest site, Punta Suarez, Espanola Island, Galapagos
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Tui De Roy / Waved albatross (Phoebastria irrorata) pair in courtship display at nest site, Punta Suarez, Espanola Island, Galapagos
Mallard (Anas platyrhynchos) pair greeting on snow-covered pond. Acadia National Park, Maine, USA.
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George Sanker / Mallard (Anas platyrhynchos) pair greeting on snow-covered pond. Acadia National Park, Maine, USA.
Mallard (Anas platyrhynchos)pair  greeting on snow-covered pond. Acadia National Park, Maine, USA.
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George Sanker / Mallard (Anas platyrhynchos)pair greeting on snow-covered pond. Acadia National Park, Maine, USA.
Pair of Rosalia longicorns (Rosalia alpina) climbing up a Beech tree (Fagus sylvatica) whilst mating, Upper Bavaria, Germany, August.
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Konrad Wothe / Pair of Rosalia longicorns (Rosalia alpina) climbing up a Beech tree (Fagus sylvatica) whilst mating, Upper Bavaria, Germany, August.
Kori bustard (Ardeotis kori) male courtship display, Kgalagadi Transfrontier Park, Northern Cape, South Africa.
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Ann & Steve Toon / Kori bustard (Ardeotis kori) male courtship display, Kgalagadi Transfrontier Park, Northern Cape, South Africa.
Fireflies (Luciola parvula himebotaru) flashing at night for courtship and reproduction.  Gifu, Japan. Composite image
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Tony Wu / Fireflies (Luciola parvula himebotaru) flashing at night for courtship and reproduction. Gifu, Japan. Composite image
Close-up of a pair of Nursery web spiders (Pisaura mirabilis) mating, UK. Captive.
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James Dunbar / Close-up of a pair of Nursery web spiders (Pisaura mirabilis) mating, UK. Captive.
Pair of Grey seals (Halichoerus grypus) mating on a beach, Norfolk, England, UK. December.
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Dave Bevan / Pair of Grey seals (Halichoerus grypus) mating on a beach, Norfolk, England, UK. December.
Pair of Grey seals (Halichoerus grypus) mating on a beach, Norfolk, England, UK. December.
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Dave Bevan / Pair of Grey seals (Halichoerus grypus) mating on a beach, Norfolk, England, UK. December.
Pair of Great crested grebes (Podiceps cristatus) courting, Cardiff, Wales, UK, March.
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Andy Rouse / Pair of Great crested grebes (Podiceps cristatus) courting, Cardiff, Wales, UK, March.
Pair of Great crested grebes (Podiceps cristatus) courting, Cardiff, Wales, UK, March.
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Andy Rouse / Pair of Great crested grebes (Podiceps cristatus) courting, Cardiff, Wales, UK, March.
Pair of Sea lampreys (Petromyzon marinus) spawning, one attempting to move a rock, River Wye, UK, June.
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John Waters / Pair of Sea lampreys (Petromyzon marinus) spawning, one attempting to move a rock, River Wye, UK, June.
Timelapse Frogs (Rana temporaria) spawning in garden pond, Somerset, England, UK. March.
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John Waters / Timelapse Frogs (Rana temporaria) spawning in garden pond, Somerset, England, UK. March.