1
Native to Australia, the thylacine was a carnivorous marsupial with a unique appearance resembling a mix of a dog and a cat. It was declared extinct in the 20th century, with the last known individual dying in captivity in 1936.
2
Once one of the most abundant bird species in North America, the passenger pigeon faced rapid population decline due to habitat loss and overhunting. The last known passenger pigeon, named Martha, died in captivity in 1914.
3
The baiji, a freshwater dolphin native to China's Yangtze River, was declared functionally extinct in the early 2000s due to pollution, habitat destruction, and overfishing.
4
Also known as the bucardo, the Pyrenean ibex was a wild goat native to the Pyrenees Mountains in Spain and France. It was the first species to be cloned, but the cloned individual died shortly after birth, marking the official extinction of the species in 2000.
5
A subspecies of the plains zebra, the quagga was native to South Africa. It was hunted to extinction for its meat and hide, with the last individual dying in captivity in 1883.
6
Native to the Tecopa Hot Springs in California, USA, the Tecopa pupfish was a small, vibrant blue fish that faced extinction due to habitat destruction and water diversion. It was declared extinct in the wild in 1970, with a few individuals remaining in captivity.