Alex Mustard / Western clown anemonefish (Amphiprion ocellaris) poses with a large, dominant female behind. The clownfish in the foreground is probably a juvenile. Bitung, North Sulawesi, Indonesia. Lembeh Strait, M...
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Terry Whittaker / Mandarin duck (Aix galericulata) male female pair, Reddish Vale Country Park, Greater Manchester, UK. December
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Steven David Miller / Eclectus parrot (Eclectus roratus) female perched in a tree, The Wildlife Habitat Zoo, Port Douglas, Queensland, Australia. August. Captive.
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Theo Bosboom / Variable damselfly (Coenagrion pulchellum) pair mating, De Peel National Park, the Netherlands, July.
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Jussi Murtosaari / Blackcap (Sylvia atricapilla) female and two males huddling together for warmth while sleeping, Finland, May.
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Lou Coetzer / Pintailed whydah (Vidua macroura) male displaying to female, Masai Mara, Kenya.
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Andres M. Dominguez / Red deer (Cervus elaphus) stag and two hinds, Los Alcornocales Natural Park, southern Spain, September.
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Bence Mate / Flock of Mallard ducks (Anas platyrhynchos) taking off, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. December.
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Bence Mate / Red footed falcon (Falco vespertinus) pair mating, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.
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Bence Mate / Red footed falcon (Falco vespertinus) pair mating, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.
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Wim van den Heever / African lion (Panthera leo) male female pair reflected in water, Okavango Delta, Botswana
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Markus Varesvuo / Female Capercaillie (Tetrao urogallus) ready to mate, Vaala, Finland, May.
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Brandon Cole / Sockeye salmon (Oncorhynchus nerka) interacting in shallow river, males chasing each other while female waits over gravel suitable for depositing her eggs after fertilization. Adams River, British Col...
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Markus Varesvuo / Black grouse (Lyrurus tetrix) mating in snow, Utajarvi, Finland, May.
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Nick Garbutt / Bare-faced Curassow (Crax fasciolata) male and female, Near Araras Lodge, Mato Grosso, Northern Pantanal, Brazil, South America.
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Dong Lei / Asian paradise-flycatcher (Terpsiphone paradisi) pair perched on branch, Shanyang town, Gutian County, Hubei province, China.
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Markus Varesvuo / Capercaillie (Tetrao urogallus) male calling with female, Jalasjarvi, Finland, April
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Juan Carlos Munoz / Black howler monkeys (Alouatta caraya) male and two females calling from tree, captive, Apenheul Park, Netherlands.
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Paul Harcourt Davies / Short-horned grasshoppers (Calliptamus italicus) mating, showing sexual dimorphism, Pescia Romana, Tarquinia, Umbria, Italy, September
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Ross Hoddinott / 2020VISION / Common blue damselfly {Enallagma cyathigerum}, mating pair, Little Bradley Ponds, Devon, UK. July. 2020VISION Book Plate.
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Ross Hoddinott / 2020VISION / Common blue damselfly {Enallagma cyathigerum}, mating pair, Little Bradley Ponds, Devon, UK. July
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Konrad Wothe / Eclectus Parrot (Eclectus roratus) courtship behaviour in rainforest, Cape York Peninsula, North Queensland, Australia, captive
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Wild Wonders of Europe / Varesvuo / Red-footed Falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary
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Wild Wonders of Europe / Varesvuo / Red-footed Falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary, May 2008
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Wild Wonders of Europe / Varesvuo / Red-footed Falcon (Falco vespertinus) male brings vole prey to female in nestbox, Hortobagy NP, Hungary, May 2008
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Wild Wonders of Europe / Varesvuo / Red-footed Falcon (Falco vespertinus) pair perched, male on left, Hortobagy NP, Hungary, May 2008
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Wild Wonders of Europe / Varesvuo / Red-footed falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary, May 2008
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Wild Wonders of Europe / Varesvuo / Red-footed falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary, May 2008
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Wild Wonders of Europe / Varesvuo / Red-footed falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary, May 2008
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Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia
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Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia
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Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia
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Gabriel Rojo / South American / Patagonian sealion pair mating {Otaria flavescens} Valdez peninsula, Argentina. Note large difference in size between male and female
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Gabriel Rojo / South American / Patagonian sealion pair {Otaria flavescens} on beach, Valdez peninsula, Argentina
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Gabriel Rojo / South American / Patagonian sealion pair {Otaria flavescens} Valdez peninsula, Argentina
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Doug Allan / Southern elephant seal pair courtship {Mirounga leonina} Antarctica
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Doug Allan / Southern elephant seal pair courtship {Mirounga leonina} Antarctica. NB Large difference in size of male and female.
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David Shale / Deep sea Anglerfish male. Male is ten times smaller than female and has well developed olfactory system to help locate females in the darkness, Atlantic ocean
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Ron O'Connor / Nephilia spider pair on web, Kruger NP, South Africa. Note huge size difference - female is larger.
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Thomas Marent / Banana Spider (Nephila clavipes) female and smaller male, Bocas del Toro, Panama
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Mark Raycroft / Woodland Caribou (Rangifer tarandus caribou) bull displaying to female, Newfoundland, Canada
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Donald M. Jones / Northern Pintail (Anas acuta) males flying with female in spring courtship display, Montana
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Donald M. Jones / Bighorn Sheep (Ovis canadensis) female and male in winter, Jasper National Park, Alberta, Canada
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Chien Lee / Stick Insect (Monticomorpha flavolimbata) pair mating in mountains, Bengoh Range, Ecuador
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Donald M. Jones / Bighorn Sheep (Ovis canadensis) ewe and ram, western Montana
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Michael Quinton / Dall's Sheep (Ovis dalli) ram, lamb, and ewe, Yukon Territory, Canada
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Luciano Candisani / Green Anaconda (Eunectes murinus) female constricting male after copulation, after which she will consume him, Brazil
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Alan Murphy/ BIA / Northern Bobwhite (Colinus virginianus) female and male, Texas