Tony Wu / Humphead parrotfish (Bolbometopon muricatum) shoal spawning in early morning, part of mass aggregation of thousands of fish. Caroline Islands, Palau.
01618014
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.
01392996
Ingo Arndt / Tisza mayflies (Palingania longicauda) swarming, River Tisza, Hungary, June
01385760
Ingo Arndt / Mayflies (Palingenia longicauda) swarming, Tisza river, Hungary, June
01279764
Ingo Arndt / Ladybirds (Hippodamia convergens) gathering to mate, California, USA.
01526630
Tony Wu / Twinspot snapper (Lutjanus bohar) engaged in a mass spawning aggregation early in the morning. Caroline Islands, Palau. April. Winner of Underwater category, Wildlife Photographer of the Year 2016.
00524358
Matthias Breiter / Red-sided Garter Snake (Thamnophis sirtalis parietalis) group mating after hibernation, Narcisse, Manitoba, Canada
01422798
Juergen Freund / Flexible Leather Coral (Sinularia flexibilis) spawning during the annual mass coral spawning event, in November, Great Barrier Reef, Queensland, Australia
01360218
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of salmon on river bed, annual spawning run, Adams River, British Columbia, Canada, October
01360215
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of annual spawning run, Adams River, British Columbia, Canada, October
01360214
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of annual spawning run, Adams River, British Columbia, Canada, October
01288661
Stephen Dalton / Swarm of Dance flies (Hilara maura) courtship behaviour over water, UK
01284966
Solvin Zankl / Mating swarm of Long-tailed / Tisza mayflies (Palingenia longicauda) Tisza river, Hungary, Every female is approached by several mature males. Eventually the female mates with one of them on the water...
01284963
Solvin Zankl / Mating swarm of Long-tailed / Tisza mayfly(Palingenia longicauda) Every female is approached by several mature males. Eventually the female mates with one of them on the water surface. June 2008
01284959
Solvin Zankl / Female Long-tailed / Tisza mayfly (Palingani a longicauda) rise up in the air soon after mating, where they form huge swarms and are out of range from males still searching for mates close to the wate...
01284957
Solvin Zankl / Female Long-tailed / Tisza mayfly (Palingani a longicauda) rise up in the air soon after mating, where they form huge swarms and are out of range from males still searching for mates close to the wate...
01159684
Willem Kolvoort / Common frogs (Rana temporaria) mating amongst a mass of frogspawn, Holland
00135457
Norbert Wu / Emperor Penguin (Aptenodytes forsteri) group on ice edge, calls are used to recognize each other and form pairs for mating, Antarctica
00150727
Fred Bavendam / Horseshoe Crab (Limulus polyphemus) group crawling ashore on the high tides of spring to lay their eggs in Delaware Bay's sandy beaches, New Jersey
01618015
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.
01618013
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.
01618008
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.
01610174
Doc White / Mass of Chum salmon (Oncorhynchus keta), many spawning. Southeast Alaska, USA. July.
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Doc White / Mass of Chum salmon (Oncorhynchus keta), many spawning. Southeast Alaska, USA. July.
01610176
Doc White / Mass of Chum salmon (Oncorhynchus keta), many spawning. Southeast Alaska, USA. July.
01597559
Adrian Davies / Slug (Arion ater agg) mating pair with sperm mass, Surrey, England, UK. August.
01593105
Nick Upton / Ivy bee (Colletes hederae) mating ball with a mass of males clustered around a female, Wiltshire, UK, September.
01593104
Nick Upton / Ivy bee (Colletes hederae) mating ball with a mass of males clustered around a female with other flying males patrolling above them, Wiltshire, UK, September.
01593103
Nick Upton / Ivy bee (Colletes hederae) mating ball with a mass of males clustered around a female, Wiltshire, UK, September.
01584561
Michel Roggo / Mass of dead Sockeye Salmon (Oncorhynchus nerka) after spawning, British Columbia, Canada, October. Photographed for the Freshwater Project.
01392994
Ingo Arndt / Tisza mayflies (Palingania longicauda) swarming, River Tisza, Hungary, June
01392993
Ingo Arndt / Tisza mayflies (Palingania longicauda) swarming, River Tisza, Hungary, June
01385652
Ingo Arndt / Mayflies (Palingenia longicauda) swarming, Tisza river, Hungary, June
01323449
Ingo Arndt / Horseshoe crabs (Limulus polyphemus) mass spawning at full moon, Delaware Bay, Delaware, USA, May
01323470
Ingo Arndt / Horseshoe crabs (Limulus polyphemus) mass spawning at full moon, Delaware Bay, Delaware, USA, May
01323469
Ingo Arndt / Horseshoe crabs (Limulus polyphemus) mass spawning at full moon, Delaware Bay, Delaware, USA, May
01279765
Ingo Arndt / Ladybirds (Hippodamia convergens) gathering to mate, California, USA.
01055795
Francois Savigny / Male Anaconda, wounded by Caiman, emerges from breeding ball {Eunectes murinus} Venezuela
01542403
Pascal Kobeh / Red snappers / Two-spot red snappers (Lutjanus bohar) mass shoal of fish spawning, Palau, Philippine Sea. A few black and white snappers (Macolor niger) have crawled into the school to eat the eggs.
01546034
Cyril Ruoso / Common frog (Rana temporaria) split level view of mass of frogs mating in pond, breeding season in the Alps, France, June..
01546033
Cyril Ruoso / Common frog (Rana temporaria) split level view of mass of frogs mating in pond, breeding season in the Alps, France, June..
01546024
Cyril Ruoso / Common frog (Rana temporaria) pair in amplexus underwater next to mass of spawn, breeding season in the Alps, France, June..
01546011
Cyril Ruoso / Common frog (Rana temporaria) looking down on mass of frogs in breeding pond surrounded by snow, Alps, France, June..
01546008
Cyril Ruoso / Common frog (Rana temporaria) mass of frogs moving across snow towards pond in breeding season in the Alps, France, June..
01546007
Cyril Ruoso / Common frog (Rana temporaria) mass of frogs moving across snow towards pond in breeding season in the Alps, France, June..
00561262
Ingo Arndt / Tisza Mayfly (Palingenia longicauda) swarming, Danube Delta, Romania
01502408
Paul Williams / Horseshoe crab (Limulus polyphemus) mass emergence to breed and deposit eggs at night, Delaware Bay, USA.
01502407
Paul Williams / Horseshoe crab (Limulus polyphemus) mass emergence to breed and deposit eggs at night, Delaware Bay, USA.
01477743
John Abbott / Springtails (Hypogastrura sp.) in mass mating aggregation, Austin, Travis County, Texas, USA.
01472303
Alex Mustard / Large school of Bohar snappers (Lutjanus bohar) gather with smaller shoal of Batfish (Platax orbicularis) in open water off Ras Mohammed at the tip of Sinai, Egypt. These schools gather only in summer...
01466731
Michel Roggo / Sockeye Salmon (Oncorhynchus nerka) travelling upstream on spawning migration, Adams river, British Columbia, Canada, October Taken for the Freshwater Project.
01466730
Michel Roggo / Sockeye Salmon (Oncorhynchus nerka) travelling upstream on spawning migration, Adams river, British Columbia, Canada, October Taken for the Freshwater Project.
00524264
Matthias Breiter / Red-sided Garter Snake (Thamnophis sirtalis parietalis) group mating after hibernation, Narcisse, Manitoba, Canada
00524257
Matthias Breiter / Red-sided Garter Snake (Thamnophis sirtalis parietalis) group mating after hibernation, Narcisse, Manitoba, Canada
00524256
Matthias Breiter / Red-sided Garter Snake (Thamnophis sirtalis parietalis) group mating after hibernation, Narcisse, Manitoba, Canada
00524255
Matthias Breiter / Red-sided Garter Snake (Thamnophis sirtalis parietalis) group mating after hibernation, Narcisse, Manitoba, Canada
00455065
Cyril Ruoso / Common Frog (Rana temporaria) group in partially frozen pond at around 2000 meters, Alps, France
00455048
Cyril Ruoso / Common Frog (Rana temporaria) pair in amplexus, Alsace, France
00455044
Cyril Ruoso / Common Frog (Rana temporaria) pair in amplexus, Alsace, France
00445329
Cyril Ruoso / European Toad (Bufo bufo) pairs in amplexus in breeding pond in February, Alsace, France
00445328
Cyril Ruoso / European Toad (Bufo bufo) pairs in amplexus in breeding pond in February, Alsace, France
00445318
Cyril Ruoso / European Toad (Bufo bufo) pair in amplexus in breeding pool eighteen hundred meters high in the Alps, France
00445297
Cyril Ruoso / European Toad (Bufo bufo) pair in amplexus in breeding pond in February, Alsace, France
01422800
Juergen Freund / Staghorn coral (Acropora cervicornis) spawning during the annual mass coral spawning event, in November, Great Barrier Reef, Queensland, Australia
01422799
Juergen Freund / Staghorn coral (Acropora cervicornis) spawning during the annual mass coral spawning event, in November, Great Barrier Reef, Queensland, Australia
01422797
Juergen Freund / Leather coral (Sarcophyton sp.) spawning during the annual 'mass' coral spawning event, in November, Great Barrier Reef, Queensland, Australia
01422791
Juergen Freund / Leather coral (Sarcophyton sp.) spawning during the annual 'mass' coral spawning event, in November, Great Barrier Reef, Queensland, Australia
01422790
Juergen Freund / Leather coral (Sarcophyton sp.) spawning during the annual 'mass' coral spawning event, in November, Great Barrier Reef, Queensland, Australia
01422789
Juergen Freund / Staghorn coral (Acropora cervicornis) spawning during the annual mass coral spawning event, in November, Great Barrier Reef, Queensland, Australia
00487122
Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) mass mating, La Selva Biological Research Station, Costa Rica
01397700
John Cancalosi / American toad (Bufo americanus) several males attempting to mate with one female, New York, USA
01397699
John Cancalosi / American toad (Bufo americanus) several males attempting to mate with one female, New York, USA
01397698
John Cancalosi / American toad (Bufo americanus) several males attempting to mate with one female, New York, USA
01397697
John Cancalosi / American toad (Bufo americanus) several males attempting to mate with one female, New York, USA
01397696
John Cancalosi / American toad (Bufo americanus) several males attempting to mate with one female, New York, USA
01360217
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of salmon on river bed, annual spawning run, Adams River, British Columbia, Canada, October
01360216
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of salmon on river bed, annual spawning run, Adams River, British Columbia, Canada, October
01360208
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) underwater view of annual spawning run, Adams River, British Columbia, Canada, October
01360207
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) underwater view of annual spawning run, Adams River, British Columbia, Canada, October
01360206
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) roe eggs from spawning run left in Adams River, British Columbia, Canada, October
01360210
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) underwater view of annual spawning run, Adams River, British Columbia, Canada, October
01360213
Todd Mintz / Sockeye salmon (Oncorhynchus nerka) underwater view of annual spawning run, Adams River, British Columbia, Canada, October
00463397
Christian Ziegler / Misfit Leaf Frog (Agalychnis saltator) mass mating, La Selva, Costa Rica
01344261
Nature Production / Toad (Bufo japonicus formosus) males fighting to mate with females, Nikko, Tochigi, Japan, May
00449877
Thomas Marent / Common Frog (Rana temporaria) pair in amplexus with egg spawn, Switzerland
00449876
Thomas Marent / Common Frog (Rana temporaria) pair in amplexus with egg spawn, Switzerland
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Thomas Marent / Common Frog (Rana temporaria) pair in amplexus with egg spawn, Switzerland
01318758
Doug Wechsler / Horseshoe crabs (Limulus polyphemus) gathering to spawn, and gulls gathering to eat the eggs. Delaware Bay, NJ, USA. May
00443833
Murray Cooper / Small Fruit Fly (Drosophilidae) group using mushroom as nuptial mating ground, Amazon, Ecuador
00442931
Pete Oxford / Horseshoe Crab (Limulus polyphemus) group on shore during mass spawn, Little St. Simon's Island, Georgia
01284965
Solvin Zankl / Mating swarm of Long-tailed / Tisza mayfly(Palingenia longicauda) Tisza river, Hungary. Every female is approached by several mature males. Eventually the female mates with one of them on the water su...
01284964
Solvin Zankl / Mating swarm of Long-tailed / Tisza mayfly (Palingenia longicauda) Tisza river, Hungary. Every female is approached by several mature males. Eventually the female mates with one of them on the water s...
01284960
Solvin Zankl / Female Long-tailed / Tisza mayfly (Palingani a longicauda) rise up in the air soon after mating, where they form huge swarms and are out of range from males still searching for mates close to the wate...
01284958
Solvin Zankl / Female Long-tailed / Tisza mayfly (Palingani a longicauda) rise up in the air soon after mating, where they form huge swarms and are out of range from males still searching for mates close to the wate...
01277170
Philip Dalton / Lake flies (Chironomid sp) swarming, mating behaviour, Lake Victoria, Uganda
01277179
Philip Dalton / Lake flies (chironomid sp) swarming over Lake Victoria, mating behaviour, Uganda