Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) group gathered for mating, Whyalla, South Australia, Australia

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...

Luciano Candisani / Green Anaconda (Eunectes murinus) female constricting male after copulation, after which she will consume him, Brazil

Cyril Ruoso / Bonobo (Pan paniscus) male and female copulating, Lola ya Bonobo Sanctuary, Democratic Republic of Congo

Jussi Murtosaari / Woodland brown butterflies (Lopinga achine) copulating, Kanta-Hame, southern Finland, June.

Matthias Breiter / Red-sided Garter Snake (Thamnophis sirtalis parietalis) group mating after hibernation, Narcisse, Manitoba, Canada

Hiroya Minakuchi / Nudibranch (Hypselodoris bullockii) pair mating, Borneo, Malaysia

Vincent Grafhorst / African Lion (Panthera leo) pair mating, Khutse Game Reserve, Botswana

Vincent Grafhorst / African Lion (Panthera leo) pair copulating, Moremi Game Reserve, Okavango Delta, Botswana

Vincent Grafhorst / African Lion (Panthera leo) pair copulating, Moremi Game Reserve, Okavango Delta, Botswana

Thomas Marent / Golden Poison Dart Frog (Phyllobates terribilis) pair mating, Cauca, Colombia

Mitsuaki Iwago / African Lion (Panthera leo) mating pair quarreling, Serengeti National Park, Tanzania