Evarra tlahuacensis, FMNH 3681, paratype. Conservation status: extinct. Only specimen in existence. Field Museum of Natural History, Chicago.

Floreana Giant Tortoise (Chelonoidis niger). Conservation status: extinct. Field Museum of Natural History, Chicago.

Narrow-headed Ant (Formica exsecta), FMNH INS-112837. Field Museum of Natural History, Chicago.

Okapi (Okapia johnstoni), FMNH 104084. Conservation status: endangered. Field Museum of Natural History, Chicago.

Olm or Proteus (Proteus anguinus), FMNH 15928-9. Conservation status: vulnerable. Field Museum of Natural History, Chicago.

Chinese Pangolin (Manis pentadactyla), FMNH 32511. Conservation status: critically endangered. Field Museum of Natural History, Chicago.

Sunda Pangolin (Manis javanica), FMNH 91353 (skin with claw). Conservation status: critically endangered. Field Museum of Natural History, Chicago.

Alligator sinensis, Chinese Alligator, FMNH no. 38234. Conservation status: critically endangered. Field Museum of Natural History, Chicago.

Hippoglossus hippoglossus, Atlantic Halibut, FMNH no. 51402. Conservation status: endangered. Field Museum of Natural History, Chicago.

Acipenser fulvescens, Lake Sturgeon, FMNH no. 98256. Conservation status: least concern. Field Museum of Natural History, Chicago.

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

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

Left to right: Camiguin Hanging-Parrot (Loriculus camiguinensis) and Hyacinth Macaw (Anodorhyncus hyacinthinus). Field Museum of Natural History, Chicago. Conservation status of macaw: endangered. Cam...

Grand Cayman Thrush (Turdus ravidus), Field Museum of Natural History, Chicago. No. 20402. Conservation status: extinct.

The Grand Cayman thrush was once endemic to the island of Grand Cayma...

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 b...