Since the year 1500 CE numerous mammal species have become extinct, according to the International Union for Conservation of Nature. Not surprisingly perhaps, their demise is mostly down to us. More alarmingly however is that several species have disappeared within the last 100 years or so.
On September 29, 2021, the US government stated its intention to declare 23 new species of animals extinct. This depressingly long list includes the ivory-billed woodpecker, which was last sighted 80 years ago. Some of these species have been unofficially extinct for decades, but experts warn that climate change will make such disappearances more and more common.
Browse the gallery and take a look at the unlucky species you'll never see at all.