Shane Gross / American crocodile (Crocodylus acutus) with open mouth amongst Seagrass (Alismatales). Gardens of the Queen National Park, Cuba.

Nick Garbutt / RF - Skull of a male Himalayan ibex (Capra sibirica) (killed by a snow leopard) lying on steep rocky slope. Himalayas, Ladakh, northern India. (This image may be licensed either as rights managed or r...

Ann & Steve Toon / Pied crows (Corvus albus) perched on horns of antelope skull. Zimanga Private Game Reserve, KwaZulu-Natal, South Africa.

Claudio Contreras / American crocodile (Crocodylus acutus) extreme close up with jaws open, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Pete Oxford / Konyak Naga boy peering out of house decorated with buffalo skulls, Konyak Naga headhunting Tribe.Mon district, Nagaland, North East India, October 2014.

Pete Oxford / Head-hunted human skulls, collected by the Konyak Naga tribe, North East India, October 2014.

Pete Oxford / Konyak Naga tattooed Ang or Chief. Only someone who has killed and taken a human head can be tattooed in this manner. Mon district. Nagaland, North East India, October 2014.

Jabruson / Western Gorilla (Gorilla gorilla) silverback skull with butterfly (Belenois theszi). Gorilla diedd from the Ebola Virus, which killed 128 people in the region in 2003 and in 2005 killed 95% of the Gor...

Adrian Davies / Anti-fracking protest, sign attached to hedge, Balcombe, West Sussex, England. 19th August 2013.

Alex Hyde / Death's Head Hawkmoth (Acherontia atropos) against white background. Captive, UK.

Paul D Stewart / Chromolithograph illustration of Cromagnon 'Skull of an old man' Plate 1, Section C. Edouard Lartet and Henry Christy. 'Reliquiae Aquitanicae' 1865-1875, Williams and Norgate, London 1875..

Paul D Stewart / Skull of Moa or Dinornis discovered by Mr. Walter Mantell on the North Island of New Zealand. Plate with later tinting, from Gideom Mantell's petrifactions and their teachings (1851) published by Henr...

Juergen Freund / Skull cave in Milne Bay. These skulls are said to be heads of decapitated enemies of the people living here in the olden days. Papua New Guinea, October 2008.

Juergen Freund / Very old human skulls on a ledge in the karst limestone walls of a Raja Ampat island. Raja Ampat, West Papua, Indonesia, February 2010

Pete Oxford / Finch specimens (Emberizidae) at the Charles Darwin Research Station, Puerto Ayora, Santa Cruz Island, Galapagos Islands

Wild Wonders of Europe / Hamblin / Konik horse skull, Oostvaardersplassen, Netherlands, June 2009

Mark Bowler / Isula / Bullet ant (Paraponera clavata) close-up showing mandibles, Peru

Doc White / Skull of Japanese Sailor. Truk Lagoon, Chuuk islands, Federated States of Micronesia.

Laurent Geslin / Skull and teeth of Blue monkey {Cercopithecus mitis}

Laurent Geslin / Skeleton of a Sparrowhawk {Accipiter nisus}

Jabruson / Human skulls of Tutsi victims, genocide memorial, Ntarama church, Nyamata, Rwanda

Nick Garbutt / Skull of extinct Saber-toothed tiger (Smilodon populator). Life size resin replica. Photographed with natural light.

Nick Garbutt / Skull of Bengal tiger (Panthera tigris tigris) from India. Life size resin replica. Photographed with multiple flash set up.

Nick Garbutt / Skull of Bengal tiger (Panthera tigris tigris) from India. Life size resin replica. Photographed with natural light.

Paul Harcourt Davies / Close up of Harvestman (Metaphalangium cirtanum) head and mandible, Umbria, Italy. September.

Edwin Giesbers / Vet doing a check-up on Eurasian lynx (Lynx lynx) kitten, aged five weeks, breeding and reintroduction program, Germany. Captive. July.

Gabriel Rojo / Guanaco jaw, with burnt remains of native vegetation in the calden forest, (Larrea divaricata) during the summer fires, Lihue Calel National Park ,La Pampa province, Argentina

Etienne Littlefair / Speckled brown snake (Pseudechis guttata) feeding on a metamorph knife-footed frog (Cyclorana cultripes), Barkly Tablelands, Northern Territory, Australia, April.

Etienne Littlefair / Speckled brown snake (Pseudechis guttata) feeding on a metamorph knife-footed frog (Cyclorana cultripes), Barkly Tablelands, Northern Territory, Australia, April.

Andy Murch / Brown catshark (Apristurus brunneus) jaw bones. Vancouver Island, Canada.

Aaron Gekoski / World Animal Protection / Olive baboon (Papio anubis) heads and skulls for sale alongside hornbills at a voodoo market outside of Ouidah, Benin, West Africa. January 2020.Mandatory credit: Aaron Gekoski / World Animal Protecti...

Sirachai Arunrugstichai / Researcher looking at the dried jaws of a Bull shark (Carcharhinus leucas) displayed for sale at souvenir shop in tourist area, Phuket Province, Thailand, October 2014. Dried jaws are common items...

Sirachai Arunrugstichai / Skinned head of a Bull shark (Carcharhinus leucas) in a factory where sharks are processed into food. The flesh is stripped from the head and the dried jaws sold as souvenirs, Ranong Province, Thailan...

Pal Hermansen / Beluga whale (Delphinapterus leucas) skulls in a line, Kvitfiskodden, Bellsundet, Svalbard, Norway. 2007. There was intensive hunting in this area in the 1920s and 1930s

Pal Hermansen / Polar bear (Ursus maritimus) skull. Svalbard, Norway.

Pal Hermansen / Beluga whale (Delphinapterus leucas) skulls and skeletons from a period of intense hunting in the 1920s and 1930s. Bellsundet, South Spitsbergen National Park, Svalbard, Norway. July 2003.

Staffan Widstrand / Carcass of Red deer (Cervus elaphus) Oostvaardersplassen Nature Reserve, The Netherlands, April

Enrique Lopez-Tapia / Olive baboon (Papio anubis) heads and skulls for sale alongside hornbills at the voodoo market in Abomey, Benin, West Africa. Any wild animal that runs, flies, jumps or crawls is hunted to supply thes...

John Shaw / Muskox skull on autumn tundra, in Hare Fjord, Scoresby Sund, Greenland, August.

Franco Banfi / Killer whale (Orcinus orca) jaw with four teeth, on sand, washed up on beach. Vrangel Bay, Primorsky Krai, Russia.

Doug Gimesy / When over 400 'protected' Wedge-tailed Eagles (Aquila audax) were discovered killed on a Victorian farm, conservationists and animal welfare advocates were devastated. Nearly as shocking, was...

Doug Gimesy / Leah Tsang, ornithological expert from the Australian Museum, examines evidence skulls to determine whether they are wedge-tailed eagles (Aquila audax) as part on an ongoing investigation around the p...

Doug Gimesy / Leah Tsang, ornithological expert from the Australian Museum, examines evidence skulls to determine whether they are Wedge-tailed Eagles (Aquila audax) as part on an ongoing investigation around the p...

Doug Gimesy / When over 400 'protected' Wedge-tailed Eagles were discovered killed on a Victorian farm, conservationists and animal welfare advocates were devastated. Nearly as shocking, was the penalty app...

Cyril Ruoso / Wolf (Canis lupus) skull in man's hands. Wolves predate reintroduced Przewalski horse (Equus ferus przewalskii). Great Gobi B Strictly Protected Area, Mongolia. 2018.