John Chan / Male California least tern (Sternula antillarum browni) presenting fish offering to female during mating, Huntington Beach, California, USA, May.

Sven Zacek / Ural owl (Strix uralensis) male presenting prey to nesting mate. Tartumaa, Southern Estonia. April.

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.

Konrad Wothe / European Bee-eater (Merops apiaster) presents prey item to potential mate, Bulgaria

Jack Dykinga / Burrowing owl (Athene cunicularia), male presenting Insect prey to female. Female will feed it to brood. Marana, Arizona, USA. May.

John Chan / Male California least tern (Sternula antillarum browni) presenting fish offering to female during mating, disturbed by a rival male, Huntington Beach, California, USA, May.

John Chan / Male California least tern (Sternula antillarum browni) presenting fish offering to female during mating, Huntington Beach, California, USA, May.

Sven Zacek / Great crested grebe (Podiceps cristatus) pair in courtship weed dance, presenting potential nesting material to each other after diving. Otepaa Nature Park, Valgamaa, Estonia. April.

Tui De Roy / Blue-footed booby (Sula nebouxii), male presenting female with gift. Punta Vicente Roca, Isabela Island, Galapagos.

Alex Hyde / Moth (Dudusa sp) in defensive posture, presenting urticating hairs on tip of abdomen. Danum Valley, Sabah, Borneo. Sequence 2/2.

Hanne & Jens Eriksen / Great cormorant (Phalacrocorax carbo) pair bonding at nest, Germany, May.

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) female 'Eliza' aged 21 years presenting to juvenile male 'Sinbad' aged 11 years. Gombe National Park, Tanzania. October 2012.

Pal Hermansen / Artist Astri Tonooian and daughter, present 'Unsatiable' to the public. Valer, Ostfold County, Norway. September 2014.

Pal Hermansen / Land art project is presented to the public. Valer, Ostfold County, Norway. September 2014.

Andres M. Dominguez/ BIA / European Bee-eater (Merops apiaster) pair offering food during courtship, Cadiz, Spain

Michael Milicia/ BIA / Least Tern (Sterna antillarum) male offering fish to female during courtship, Massachusetts

Michael Milicia/ BIA / Least Tern (Sterna antillarum) male presenting fish to female, North America

Ingo Arndt / Whiskered Tern (Chlidonias hybrida) male passing mayfly to female during courtship, Danube Delta, Romania

Ingo Arndt / Whiskered Tern (Chlidonias hybrida) male passing dragonfly to female during courtship, Danube Delta, Romania

Brent Stephenson / Imperial shag (Phalacrocorax atriceps atriceps) pair courting at their nest site, male presenting nesting material, Saunders Island, Falkland Islands, South Atlantic, December.

Anup Shah / Olive baboon female (Papio cynocephalus anubis) presenting to Eastern chimpanzee (Pan troglodytes schweinfurtheii) juvenile male 'Gimli' aged 7 years watched by his mother 'Gremlin'. Gombe National Pa...

Anup Shah / Olive baboon (Papio anubis) female presenting to a male on the shore of Lake Tanganika. Gombe National Park, Tanzania.

Alex Hyde / Moth (Dudusa sp) in defensive posture, presenting urticating hairs on tip of abdomen. Danum Valley, Sabah, Borneo.

Sebastian Kennerknecht / African Golden Cat (Profelis aurata) researcher, Sam Isoke, giving lecture in primary school, part of an educational activity to teach children about forest animals, western Uganda

Kristel Richard / Man presenting two Lipizzaner colts during the annual Autumn Parade, Piber Federal Stud, Maria Lankowitz, Koflach, Styria, Austria, September 2013. Editorial use only.

Jonathan Harrod / White-fronted Tern (Sterna striata) male presenting a fish as part of courtship display, Avon Heathcote Estuary, Christchurch, New Zealand

Jonathan Harrod / White-fronted Tern (Sterna striata) presenting a fish as part of courtship display, Avon Heathcote Estuary, Christchurch, New Zealand

Brent Stephenson / Male Australasian Gannet (Morus serrator) presenting seaweed to the female at the nest. Seaweed is used in constructing the nest. Cape Kidnappers, Hawkes Bay, New Zealand, September.

John Cancalosi / Saturn / Emperor Moth Caterpillar (Automeris metzli) coiled presenting a defensive display and irritant hairs. Santa Rosa National Park tropical dry forest, Costa Rica.

John Cancalosi / Saturn / Emperor Moth Caterpillar (Automeris metzli) coiled presenting a defensive display and irritant hairs. Santa Rosa National Park tropical dry forest, Costa Rica.

Matthew Maran / A hiker presenting his water-wrinkled foot to the camera. The West Coast Trail, Pacific Rim National Park, Vancouver Island, Canada, September 2010. Model released.

Konrad Wothe / European Roller (Coracias garrulus) presents prey item to potential mate, Bulgaria

Konrad Wothe / European Roller (Coracias garrulus) presents prey item to potential mate, Bulgaria

Anup Shah / Olive baboon (Papio cynocephalus anubis) female presenting her rear to a male, Masai Mara National Reserve, Kenya. March.

Anup Shah / Olive baboon (Papio cynocephalus anubis) male standing on his hind legs watching a female presenting her rear, Masai Mara National Reserve, Kenya. February.

Anup Shah / Gelada baboon (Theropithecus gelada) female presenting to a male to show she is sexually receptive, Simien Mountains National Park, Ethiopia, November

Niall Benvie / Common ravens (Corvus corax) courtship, male presenting gift to female, Estonia

Michael Hutchinson / Little Grebe (Tachybaptus ruficollis), parent presenting insect larva prey to chick, Derbyshire, UK

Ben Osborne / Bill Oddie presenting Bird in the Nest series with cameraman, 1994

Anup Shah / Leopard (Panthera pardus) presenting young with food (hare). Masai Mara, Kenya, East Africa

Sebastian Kennerknecht / African Lion (Panthera leo) biologists, Caz Sanguinetti and Kim Young-Overton, giving presentation to tour guides, Kafue National Park, Zambia

Tui De Roy / Flightless Cormorant (Phalacrocorax harrisi) male giving nesting material gift to female, Galapagos Islands, Ecuador

Sergey Gorshkov / Leopard (Panthera pardus) female presenting herself to male at night, Botswana

PETER CRAWFORD / Presenter Julian Pettifer on Mauna Kea, presenting BBC programme 'Global Sunrise', 1996

Lucas Bustamante / Blue-footed boobies (Sula nebouxii) pair, male presenting nest material during courtship display. Machalilla National Park, Manabi, Ecuador, August.

Mateusz Piesiak / White-winged tern (Chlidonias leucopterus) pair, courtship display, male presenting female with nuptial gift, Biebrza National Park, Poland. May.

Manuel Gracia / European roller (Coracias garrulus) pair performing courtship feeding ritual and then mating. The male enters frame and presents an insect, the female takes the food and then they mate. After mating,...

Manuel Gracia / European roller (Coracias garrulus) pair performing courtship feeding ritual and then mating. The female enters frame and then calls to her mate. The male lands on the perch and presents an insect, sh...

Manuel Gracia / Close up of European roller (Coracias garrulus) pair performing courtship feeding ritual and then mating. The male enters frame and presents an insect, the female takes the food and then they mate. A...

Manuel Gracia / European roller (Coracias garrulus) pair performing courtship feeding ritual. The male is perched and the female lands on perch with food and then the male tries to take food from female. Seville, Spa...

Thomas Hinsche/ BIA / Eurasian Hoopoe (Upupa epops) male presenting insect prey to female as part of courtship, Kiskunsag National Park, Hungary

Thomas Hinsche/ BIA / Red-backed Shrike (Lanius collurio) male presenting prey to female during courtship, Saxony-Anhalt, Germany

Thomas Hinsche/ BIA / European Bee-eater (Merops apiaster) male presenting prey to female during courtship, Saxony-Anhalt, Germany

Tim Laman / Magnificent bird of paradise (Cicinnurus magnificus) male, leaning back and presenting his breast shield and raised cape to two females, courtship display, Arfak Mountains, West Papua, Indonesia.

Doug Perrine / Laysan albatross (Phoebastria immutabilis) pair, male presenting nesting material during courtship. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument, Nort...

Doug Perrine / White tern (Gygis alba candida) pair, male presenting female with juvenile flying fish, a nuptial gift. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument,...