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Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered.  -  Morley Read
01631498
Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered.
Developing embryo of the Ecuadorian monkey frog (Phyllomedusa ecuatoriana), showing heart beating and blood flowing, Morona Santiago Province, Ecuador, (non-ex)  -  Morley Read
01626496
Morley Read / Developing embryo of the Ecuadorian monkey frog (Phyllomedusa ecuatoriana), showing heart beating and blood flowing, Morona Santiago Province, Ecuador, (non-ex)
Aerial shot of Killer whales (Orcinus orca) near the surface, showing mating behaviour including a male Killer whale displaying penis, Troms, Norway, August.  -  Espen Bergersen
01621774
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.
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.  -  Franco  Banfi
01615309
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.
Female Giant wood wasp (Uroceras gigas) inserting ovipositor into tree stump to lay eggs, Carmarthenshire, Wales, UK, September.  -  Dave Bevan
01590321
Dave Bevan / Female Giant wood wasp (Uroceras gigas) inserting ovipositor into tree stump to lay eggs, Carmarthenshire, Wales, UK, September.
Humpback whale (Megaptera novaeangliae) male with his penis extended. Vava'u, Tonga. South Pacific.  -  Tony Wu
01543110
Tony Wu / Humpback whale (Megaptera novaeangliae) male with his penis extended. Vava'u, Tonga. South Pacific.
Black hamlet (Hypoplectrus nigricans) and Yellowbelly hamlet (Hypoplectrus aberrans) spawning at dusk. As this genus is  quite recently evolved hybridization is still possible. Hamlets are one of the...  -  Alex Mustard
01520060
Alex Mustard / Black hamlet (Hypoplectrus nigricans) and Yellowbelly hamlet (Hypoplectrus aberrans) spawning at dusk. As this genus is quite recently evolved hybridization is still possible. Hamlets are one of the...
Japanese macaque (Macaca fuscata fuscata)  rare white furred baby jumping, Jigokudani Valley,  Nagano Prefecture, Japan. June.  -  Yukihiro  Fukuda
01514937
Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby jumping, Jigokudani Valley, Nagano Prefecture, Japan. June.
Japanese macaque (Macaca fuscata fuscata) mother with rare white furred male baby, Jigokudani Valley,  Nagano Prefecture, Japan. June.  -  Yukihiro  Fukuda
01514928
Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred male baby, Jigokudani Valley, Nagano Prefecture, Japan. June.
Two Water Fleas (Daphnia sp.), showing transparency of bodies and internal organs. UK, September.  -  Stephen Dalton
01333039
Stephen Dalton / Two Water Fleas (Daphnia sp.), showing transparency of bodies and internal organs. UK, September.
Wild mature male mandrill (Mandrillus sphinx) in gallery forest during dry season. Lope National Park, Gabon. June 2008.  -  Fiona Rogers
01235243
Fiona Rogers / Wild mature male mandrill (Mandrillus sphinx) in gallery forest during dry season. Lope National Park, Gabon. June 2008.
Chamois (Rupicapra rupicapra) male with erect penis in rutting season, Gran Paradiso National Park, Italy, November 2008  -  Wild Wonders of Europe / E Haarberg
01230729
Wild Wonders of Europe / E Haarberg / Chamois (Rupicapra rupicapra) male with erect penis in rutting season, Gran Paradiso National Park, Italy, November 2008
Viperfish {Chauliodus sloani} deepsea, from the Mid-Atlantic Ridge, 400-520m, during the day  -  David Shale
01204281
David Shale / Viperfish {Chauliodus sloani} deepsea, from the Mid-Atlantic Ridge, 400-520m, during the day
Male Bonobo {Pan paniscus} sitting, looking thoughtful. Lola Ya Bonobo Sanctuary, Kinshasa, DR of Congo, 2007  -  Karl Ammann
01202187
Karl Ammann / Male Bonobo {Pan paniscus} sitting, looking thoughtful. Lola Ya Bonobo Sanctuary, Kinshasa, DR of Congo, 2007
Deepsea fish {Stomias boa} with lure and light organs, deep sea Atlantic ocean  -  David Shale
01139280
David Shale / Deepsea fish {Stomias boa} with lure and light organs, deep sea Atlantic ocean
Humpback whale {Megaptera novaeangliae} with penis extended, Pacific (taken under NMFS research permit 882 issued by Hawai Whale Research Foundation)  -  Doug Perrine
01134488
Doug Perrine / Humpback whale {Megaptera novaeangliae} with penis extended, Pacific (taken under NMFS research permit 882 issued by Hawai Whale Research Foundation)
Hamadryas baboons display red bottoms {Papio hamadryas} C  -  Anup Shah
01092231
Anup Shah / Hamadryas baboons display red bottoms {Papio hamadryas} C
Sexual play between Bottlenose {Tursiops truncatus} and Atlantic spotted dolphins {Stenella frontalis} Bahamas, Caribbean NOT FOR SALE IN USA. Dolphins are notorious for trying to mate with anything -...  -  Brandon Cole
01090597
Brandon Cole / Sexual play between Bottlenose {Tursiops truncatus} and Atlantic spotted dolphins {Stenella frontalis} Bahamas, Caribbean NOT FOR SALE IN USA. Dolphins are notorious for trying to mate with anything -...
Tiger male carrying Chital deer kill, Bandhavgarh NP, Madhya Pradesh, India  -  Francois Savigny
01086141
Francois Savigny / Tiger male carrying Chital deer kill, Bandhavgarh NP, Madhya Pradesh, India
African elephant male in musth charging {Loxodonta africana} Botswana  -  Hermann Brehm
01085652
Hermann Brehm / African elephant male in musth charging {Loxodonta africana} Botswana
Male Chimpanzee sitting on tree buttress, Gombe NP Tanzania. Apollo  -  Anup Shah
01079293
Anup Shah / Male Chimpanzee sitting on tree buttress, Gombe NP Tanzania. Apollo
Glass Frog (Hyalinobatrachium aureoguttatum) underside showing internal organs, native to South America  -  Pete Oxford
00556016
Pete Oxford / Glass Frog (Hyalinobatrachium aureoguttatum) underside showing internal organs, native to South America
Glass Frog (Hyalinobatrachium aureoguttatum) underside showing internal organs, native to South America  -  Pete Oxford
00556015
Pete Oxford / Glass Frog (Hyalinobatrachium aureoguttatum) underside showing internal organs, native to South America
Glass Frog (Hyalinobatrachium aureoguttatum) underside showing internal organs, native to South America  -  Pete Oxford
00556014
Pete Oxford / Glass Frog (Hyalinobatrachium aureoguttatum) underside showing internal organs, native to South America
Northern Glassfrog (Hyalinobatrachium fleischmanni) underside showing internal organs, northwest Ecuador  -  Pete Oxford
00450317
Pete Oxford / Northern Glassfrog (Hyalinobatrachium fleischmanni) underside showing internal organs, northwest Ecuador
Viperfish (Chauliodus sloani) light organs in mouth and all along body, southeastern Pacific, deep sea  -  Norbert Wu
00135237
Norbert Wu / Viperfish (Chauliodus sloani) light organs in mouth and all along body, southeastern Pacific, deep sea
Irwin's turtle (Elseya irwini), adult male resting. Note the sediment disturbance to the rear of the turtle is caused by expulsion of water via cloacal respiration. North Johnstone River, downstre...  -  Etienne Littlefair
01666116
Etienne Littlefair / Irwin's turtle (Elseya irwini), adult male resting. Note the sediment disturbance to the rear of the turtle is caused by expulsion of water via cloacal respiration. North Johnstone River, downstre...
Ichneumon wasp (Ichneumonidae / Pimplinae) female with a long ovipositor grooming its abdomen while sunning on a Dogwood leaf on a chalk grassland slope, Bath and Northeast Somerset, UK, May.  -  Nick Upton
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Nick Upton / Ichneumon wasp (Ichneumonidae / Pimplinae) female with a long ovipositor grooming its abdomen while sunning on a Dogwood leaf on a chalk grassland slope, Bath and Northeast Somerset, UK, May.
A dog penis bracelet, held by human hands. A good luck charm in Cambodia. October 2019.  -  Aaron Gekoski
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Aaron Gekoski / A dog penis bracelet, held by human hands. A good luck charm in Cambodia. October 2019.
Honey bee (Apis mellifera), dead drone at nest entrance. Visible genitals/penis, Germany.  -  Ingo Arndt
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Ingo Arndt / Honey bee (Apis mellifera), dead drone at nest entrance. Visible genitals/penis, Germany.
Longitudinal section through the bulb of a daffodil (Narcissus sp.) showing roots, tunic , developing leaves and roots, backlit to show structure  -  Nigel Cattlin
01655736
Nigel Cattlin / Longitudinal section through the bulb of a daffodil (Narcissus sp.) showing roots, tunic , developing leaves and roots, backlit to show structure
Hoverfly (Epistrophe grossulariae) attempting to lay eggs amongst aphids. Ovipositor visible, April, UK  -  James Dunbar
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James Dunbar / Hoverfly (Epistrophe grossulariae) attempting to lay eggs amongst aphids. Ovipositor visible, April, UK
Hoverfly (Epistrophe grossulariae) taking off from flower and landing again, April, UK  -  James Dunbar
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James Dunbar / Hoverfly (Epistrophe grossulariae) taking off from flower and landing again, April, UK
Male Vervet monkey (Chlorocebus aethiops) eating a mango fruit, showing blue scrotum, Samburu Lodge, Kenya. January.  -  Will Watson
01650239
Will Watson / Male Vervet monkey (Chlorocebus aethiops) eating a mango fruit, showing blue scrotum, Samburu Lodge, Kenya. January.
Ichnumen wasp (Lissonata Sp.) female resting on a Bluebell flower, Hertfordshire, England, UK, April - Focus Stacked  -  Andy Sands
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Andy Sands / Ichnumen wasp (Lissonata Sp.) female resting on a Bluebell flower, Hertfordshire, England, UK, April - Focus Stacked
Flooding in church in Venice, Italy, December 2019.  -  Milan Radisics
01645422
Milan Radisics / Flooding in church in Venice, Italy, December 2019.
Oceanic whitetip shark (Carcharhinus longimanus), ampullae of Lorenzini electrosensory organs on underside of snout. North Kona Coast, Hawaii Island, USA.  -  Doug Perrine
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Doug Perrine / Oceanic whitetip shark (Carcharhinus longimanus), ampullae of Lorenzini electrosensory organs on underside of snout. North Kona Coast, Hawaii Island, USA.
Lion (Panthera leo) ready to mount female, Ngorongoro Crater, Tanzania.  -  Charlie  Summers
01636044
Charlie Summers / Lion (Panthera leo) ready to mount female, Ngorongoro Crater, Tanzania.
Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered.  -  Morley Read
01631499
Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered.
Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered.  -  Morley Read
01631497
Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered.
Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 10 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered.  -  Morley Read
01631496
Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 10 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered.
Grey-headed Flying-fox (Pteropus poliocephalus) hangs from one foot from a branch. Yarra Bend Park, Kew, Victoria, Australia. December, 2017.  -  Doug Gimesy
01631260
Doug Gimesy / Grey-headed Flying-fox (Pteropus poliocephalus) hangs from one foot from a branch. Yarra Bend Park, Kew, Victoria, Australia. December, 2017.
Chalcid wasp (Gasteruption jaculator) nectaring on Yarrow (Achillea millefolium) cultivar, picking up pollen on legs and head. Long ovipositor used to lays eggs inside solitary bee nests. In garden, S...  -  Heather Angel
01629338
Heather Angel / Chalcid wasp (Gasteruption jaculator) nectaring on Yarrow (Achillea millefolium) cultivar, picking up pollen on legs and head. Long ovipositor used to lays eggs inside solitary bee nests. In garden, S...
Bengal tiger (Panthera tigris) male rolling on ground after mating. Ranthambhore National Park, India.  -  Andy Rouse
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Andy Rouse / Bengal tiger (Panthera tigris) male rolling on ground after mating. Ranthambhore National Park, India.
Hen with clipped beak in battery cage on factory farm. The stress of confinement can drive hens to peck each other, so their beaks (their primary sense organs) are sometimes clipped using hot knives o...  -  Jo-Anne McArthur / We Animals
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Jo-Anne McArthur / We Animals / Hen with clipped beak in battery cage on factory farm. The stress of confinement can drive hens to peck each other, so their beaks (their primary sense organs) are sometimes clipped using hot knives o...
Meat offal, including sheep hearts, for sale at butchers counter. North London, England  -  Matthew Maran
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Matthew Maran / Meat offal, including sheep hearts, for sale at butchers counter. North London, England
Nurse sharks (Ginglymostoma cirratum) ready to mate. Showing male claspers, which are used to channel semen into the female during mating, Eleuthera, Bahamas.  -  Shane Gross
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Shane Gross / Nurse sharks (Ginglymostoma cirratum) ready to mate. Showing male claspers, which are used to channel semen into the female during mating, Eleuthera, Bahamas.
Nurse sharks (Ginglymostoma cirratum) ready to mate. Showing male claspers, which are used to channel semen into the female during mating, Eleuthera, Bahamas.  -  Shane Gross
01617309
Shane Gross / Nurse sharks (Ginglymostoma cirratum) ready to mate. Showing male claspers, which are used to channel semen into the female during mating, Eleuthera, Bahamas.
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