animals that have become extinct in the past 100 years?
['Baiji dolphin. Year declared extinct: 2007. ... ', "Thylacine, also known as 'Tasmanian wolf' or 'Tasmanian tiger' Year declared extinct: 1986. ... ", 'Pinta tortoise. Year declared extinct: 2012. ... ', 'Golden toad. Year declared extinct: 1989. ... ', 'Caribbean monk seal. Year declared extinct: 2008. ... ', 'Caspian tiger. ... ', 'Formosan clouded leopard. ... ', 'Pyrenean ibex.']