Chien Lee / Minden / Stick Insect (Monticomorpha flavolimbata) pair mating in mountains, Bengoh Range, Ecuador
01696924
Neil Challis / Giant golden orb weaver spider (Nephila pilipes) focus pull from a small male to much larger female in the background, Western Thailand.
01671980
George Sanker / Elk (Cervus canadensis) bull and cow sniffing noses, Yellowstone National Park, Wyoming, USA. September.
01623038
Terry Whittaker / Mandarin duck (Aix galericulata) male female pair, Reddish Vale Country Park, Greater Manchester, UK. December
01602464
Steven David Miller / Eclectus parrot (Eclectus roratus) female perched in a tree, The Wildlife Habitat Zoo, Port Douglas, Queensland, Australia. August. Captive.
01594921
Theo Bosboom / Variable damselfly (Coenagrion pulchellum) pair mating, De Peel National Park, the Netherlands, July.
01583463
Jussi Murtosaari / Blackcap (Sylvia atricapilla) female and two males huddling together for warmth while sleeping, Finland, May.
01533706
Lou Coetzer / Pintailed whydah (Vidua macroura) male displaying to female, Masai Mara, Kenya.
01533379
Andres M. Dominguez / Red deer (Cervus elaphus) stag and two hinds, Los Alcornocales Natural Park, southern Spain, September.
01531862
Bence Mate / Flock of Mallard ducks (Anas platyrhynchos) taking off, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. December.
01531796
Bence Mate / Red footed falcon (Falco vespertinus) pair mating, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.
01531792
Bence Mate / Red footed falcon (Falco vespertinus) pair mating, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.
01529833
Wim van den Heever / African lion (Panthera leo) male female pair reflected in water, Okavango Delta, Botswana
01529686
Markus Varesvuo / Female Capercaillie (Tetrao urogallus) ready to mate, Vaala, Finland, May.
01511113
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...
01498210
Markus Varesvuo / Black grouse (Lyrurus tetrix) mating in snow, Utajarvi, Finland, May.
01493040
Nick Garbutt / Bare-faced Curassow (Crax fasciolata) male and female, Near Araras Lodge, Mato Grosso, Northern Pantanal, Brazil, South America.
01492693
Dong Lei / Asian paradise-flycatcher (Terpsiphone paradisi) pair perched on branch, Shanyang town, Gutian County, Hubei province, China.
01490060
Markus Varesvuo / Capercaillie (Tetrao urogallus) male calling with female, Jalasjarvi, Finland, April
01448823
Juan Carlos Munoz / Black howler monkeys (Alouatta caraya) male and two females calling from tree, captive, Apenheul Park, Netherlands.
01429256
Paul Harcourt Davies / Short-horned grasshoppers (Calliptamus italicus) mating, showing sexual dimorphism, Pescia Romana, Tarquinia, Umbria, Italy, September
01356707
Konrad Wothe / Eclectus Parrot (Eclectus roratus) courtship behaviour in rainforest, Cape York Peninsula, North Queensland, Australia, captive
01233131
Wild Wonders of Europe / Varesvuo / Red-footed Falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary
01233125
Wild Wonders of Europe / Varesvuo / Red-footed Falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary, May 2008
01233118
Wild Wonders of Europe / Varesvuo / Red-footed Falcon (Falco vespertinus) male brings vole prey to female in nestbox, Hortobagy NP, Hungary, May 2008
01233108
Wild Wonders of Europe / Varesvuo / Red-footed Falcon (Falco vespertinus) pair perched, male on left, Hortobagy NP, Hungary, May 2008
01233106
Wild Wonders of Europe / Varesvuo / Red-footed falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary, May 2008
01233105
Wild Wonders of Europe / Varesvuo / Red-footed falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary, May 2008
01233101
Wild Wonders of Europe / Varesvuo / Red-footed falcon (Falco vespertinus) mating pair, Hortobagy NP, Hungary, May 2008
01139756
Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia
01139755
Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia
01139754
Anup Shah / Fur Seal pair mating (Arctocephalus pusillus pusillus) Cape Cross Seal Reserve, Namibia
01130173
Gabriel Rojo / South American / Patagonian sealion pair mating {Otaria flavescens} Valdez peninsula, Argentina. Note large difference in size between male and female
01130171
Gabriel Rojo / South American / Patagonian sealion pair {Otaria flavescens} on beach, Valdez peninsula, Argentina
01130169
Gabriel Rojo / South American / Patagonian sealion pair {Otaria flavescens} Valdez peninsula, Argentina
01089443
Doug Allan / Southern elephant seal pair courtship {Mirounga leonina} Antarctica
01089442
Doug Allan / Southern elephant seal pair courtship {Mirounga leonina} Antarctica. NB Large difference in size of male and female.
01083137
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
01036985
Ron O'Connor / Nephilia spider pair on web, Kruger NP, South Africa. Note huge size difference - female is larger.
00785629
Thomas Marent / Banana Spider (Nephila clavipes) female and smaller male, Bocas del Toro, Panama
00651957
Mark Raycroft / Caribou (Rangifer tarandus) male, female, and calf, North America
00640458
Mark Raycroft / Woodland Caribou (Rangifer tarandus caribou) bull displaying to female, Newfoundland, Canada
00590905
Donald M. Jones / Northern Pintail (Anas acuta) males flying with female in spring courtship display, Montana
00590758
Donald M. Jones / Bighorn Sheep (Ovis canadensis) female and male in winter, Jasper National Park, Alberta, Canada
00580416
Chien Lee / Stick Insect (Monticomorpha flavolimbata) pair mating in mountains, Bengoh Range, Ecuador
00578809
Donald M. Jones / Bighorn Sheep (Ovis canadensis) ewe and ram, western Montana
00572988
Michael Quinton / Dall's Sheep (Ovis dalli) ram, lamb, and ewe, Yukon Territory, Canada
00568879
Luciano Candisani / Green Anaconda (Eunectes murinus) female constricting male after copulation, after which she will consume him, Brazil
