Pepperpot Earthstar (Myriostoma coliforme), FMNH C0228820F. Field Museum of Natural History, Chicago.

Peregrine Falcons (Falco peregrinus), FMNH 430570 and 390946; Eastern Screech-Owl (Otus asio), FMNH 379837. Peregrine conservation status: least concern. Field Museum of Natural History, Chicago.

Xerces Blue (Glaucopsyche xerces), Field Museum of Natural History, Chicago. No. 474. Conservation status: extinct.

Writing in 1998 about the sorrow associated with extinction, veterinaria...

Ring-tailed Lemus (Lemur catta), FMNH 174399. Conservation status: endangered. 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...

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...

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.

Maryland Darter (Ethiostoma sellare), USNM no. 212147 (specimen from the Smithsonian Museum collection, on loan to the FMNH). Field Museum of Natural History, Chicago. Conservation status: extinct.

Nile Perch (Lates niloticus), FMNH no. 55359. Field Museum of Natural History, Chicago. Conservation status: least concern. Important commercially, this species is under threat from overexploitation a...