Sergio Hanquet / Scientists performing Sperm whale (Physeter macrocephalus) calf necropsy on beach to determine cause of death, whale found drifting at sea. Tenerife, Canary Islands. 2010.

Sergio Hanquet / People watching as Sperm whale (Physeter macrocephalus) is hoisted prior to necropsy, dead whale found drifting at sea. Tenerife, Canary Islands, 2010.

Sergio Hanquet / Sperm whale (Physeter macrocephalus) in net, hoisted in air prior to necropsy, man watching in foreground. Tenerife, Canary Islands, 2010.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) hoisted in air, prior to necropsy to determine reason for death. Tenerife, Canary Islands. 2015.

Sergio Hanquet / Blainville's beaked whale (Mesoplodon densirostris) washed up dead on beach, man standing in water looking at whale, prior to necropsy to determine reason for death. Tenerife, Canary Islands. 2015...

Sergio Hanquet / Woman annotating illustrations of Sperm whale (Physeter macrocephalus) during necropsy of dead calf found drifting at sea. Tenerife, Canary Islands. 2010.

David Perpinan / Necropsy of a wild Fire salamander (Salamandra salamandra) gravid female, Barcelona, Spain. One uterine horn has been opened showing embryos. Small repro only

Tony Wu / Sperm whale (Physeter macrocephalus) skeleton of female dubbed Jubilee, on display at the Lee Kong Chian Natural History Museum in Singapore. This 10.6m adult whale was found off Jurong Island in July...

Tony Wu / Sperm whale (Physeter macrocephalus) close up developing fin in preserved male calf fetus measuring 60cm to 70cm. Origina unknown presumably removed from mother during necropsy.

Tony Wu / Sperm whale (Physeter macrocephalus) preserved male calf fetus measuring 60cm to 70cm. Origina unknown presumably removed from mother during necropsy.

Neil Aldridge / Vet working for the Endangered Wildlife Trust measuring the distance between puncture wounds in the throat of an African wild dog (Lycaon pictus) to determine the cause of death whilst undertaking a n...

Neil Aldridge / Vet working for the Endangered Wildlife Trust measuring the distance between puncture wounds in the throat of an African wild dog (Lycaon pictus) to determine the cause of death whilst undertaking a n...

Neil Aldridge / Vet working for the Endangered Wildlife Trust showing the puncture wounds in the neck of a dead African wild dog (Lycaon pictus) whilst undertaking a necropsy, Venetia Limpopo Nature Reserve, Limpopo...

Neil Aldridge / Vet working for the Endangered Wildlife Trust checking the teeth of a dead African wild dog (Lycaon pictus) whilst carrying out a necropsy, Venetia Limpopo Nature Reserve, Limpopo Province, South Afr...

Nick Hawkins / Aerial view of a dead North Atlantic right whale (Eubalaena glacialis) on beach in Cape Breton, Canada. The whale, known as 'Punctuation' to researchers, was a large female who scientists have...

Nick Hawkins / Aerial view of a dead North Atlantic right whale (Eubalaena glacialis) on beach in Cape Breton, Canada. The whale, known as 'Punctuation' to researchers, was a large female who scientists have...

Nick Hawkins / Researchers perform a necropsy on dead North Atlantic right whale (Eubalaena glacialis) on beach in Cape Breton, Canada. The whale, known as 'Punctuation' to researchers, was a large female wh...

Nick Hawkins / A dead North Atlantic right whale (Eubalaena glacialis) on beach in Cape Breton, Canada. The whale, known as 'Punctuation' to researchers, was a large female who scientists have been tracking...

Nick Hawkins / A dead North Atlantic right whale (Eubalaena glacialis) on beach in Cape Breton, Canada. The whale, known as 'Punctuation' to researchers, was a large female who scientists have been tracking...

Nick Hawkins / A dead North Atlantic right whale (Eubalaena glacialis) on beach in Cape Breton, Canada. The whale, known as 'Punctuation' to researchers, was a large female who scientists have been tracking...

Nick Hawkins / A dead North Atlantic right whale (Eubalaena glacialis) floats, Gulf of Saint Lawrence, Canada. The whale, known as 'Punctuation' to researchers, was a large female who scientists have been tr...