Espen Bergersen / Aerial shot of Killer whales (Orcinus orca) near the surface, showing mating behaviour including a male Killer whale displaying penis, Troms, Norway, August.
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Franco Banfi / Sperm whale (Physeter macrocephalus) young male trying to copulate with a female. The calf of the female was in the way so the male is trying to chase it away. Dominica.
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Tony Wu / Humpback whale (Megaptera novaeangliae) male with his penis extended. Vava'u, Tonga. South Pacific.
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Thomas Marent / Douc Langur (Pygathrix nemaeus) male, native to southeast Asia
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Eric Baccega / Portrait of Lani hunters with painted faces, head-dressed, nose adornment and penis case / gourd, Baliem valley, West Papua, former Irian-Jaya, Indonesia, August 2002
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Wild Wonders of Europe / E Haarberg / Chamois (Rupicapra rupicapra) male with erect penis in rutting season, Gran Paradiso National Park, Italy, November 2008
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Doug Perrine / Humpback whale {Megaptera novaeangliae} with penis extended, Pacific (taken under NMFS research permit 882 issued by Hawai Whale Research Foundation)
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Hermann Brehm / African elephant male in musth charging {Loxodonta africana} Botswana
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John Cancalosi / Red deer pair mating (Cervus elephus) UK
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Natasha Breed / Gelada baboons males grooming and inspecting each other's genitals {Theropithecus gelada} Ethiopia
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Doug Gimesy / Grey-headed Flying-fox (Pteropus poliocephalus) hangs from one foot from a branch. Yarra Bend Park, Kew, Victoria, Australia. December, 2017.
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Anup Shah / Olive baboon (Papio anubis) male, taken with remote camera. Masai Mara National Reserve, Kenya.
