Atitlan Grebe (Podilymbus gigas), Field Museum of Natural History, Chicago. No. 97557. Conservation status: extinct. The Atitlan grebe, also known as the poc, was a large, flightless water bird endem...

Giant Armadillo (Priodontes giganteus), FMNH 60450. Conservation status: vulnerable. Field Museum of Natural History, Chicago.

Golden Lion Tamarin (Leontopithecus rosalia), FMNH 60654. Conservation status: endangered. Field Museum of Natural History, Chicago.

Golden Snub-nosed Monkey (Rhinopithecus roxellana), FMNH 31144. Conservation status: endangered. Specimen collected by Teddy Roosavelt. Field Museum of Natural History, Chicago.

Passenger Pigeon (Ectopistes migratorius). Field Museum of Natural History, Chicago. Conservation status: extinct.

Honduran White Bat. No. 123156. Field Museum of Natural History. Huddled together under the roost they construct out of the wide, waxy leaves of the Heliconia plant, a group of Honduran white bats mo...

Thylacine (Thylacinus cynocephalus), Field Museum of Natural History, Chicago. No. 81522. Conservation status: extinct.

The last known remaining thylacine, or Tasmanian tiger, died in captiv...

White-Nosed Bush Frog (Philautus leucorhinus), Field Museum of Natural History, Chicago. Nos. 81233, 173345-67. Conservation status: extinct.

There are approximately 105 species of frog nati...

Cyclosurus mariei, a land snail, Field Museum of Natural History, Chicago. Conservation status: extinct.

Hawaiian tree snails, various species (Achatinella genus) and Carelia pilsbryi. Conservation status of all: extinct. Field Museum of Natural History, Chicago.

A Passenger Pigeon (Ectopistes migratorius) egg at the Field Museum of Natural History, Chicago. Conservation status: extinct. On 14 September 1914, the last Passenger Pigeon died in a cage in Cincinn...

A Passenger Pigeon (Ectopistes migratorius) egg at the Field Museum of Natural History, Chicago. Conservation status: extinct. On 14 September 1914, the last Passenger Pigeon died in a cage in Cincinn...

A Passenger Pigeon (Ectopistes migratorius) egg at the Field Museum of Natural History, Chicago. Conservation status: extinct. On 14 September 1914, the last Passenger Pigeon died in a cage in Cincinn...

Alan Resetar, Collection Manager of the Division of Amphibians and Reptiles at the Field Museum of Natural History, Chicago, taking tissue specimens from a cryogenic storage facility that is cooled wi...

Alan Resetar, Collection Manager of the Division of Amphibians and Reptiles at the Field Museum of Natural History, Chicago, taking tissue specimens from a cryogenic storage facility that is cooled wi...