The golden toad, Hawaiian crow, Pyrenean ibex and Spix's macaw are among several animals that have gone extinct during the past 100 years. The extinction of a species can be caused by over-hunting or overpopulation, according to List Verse.
The Thylacine, also known as the Tasmanian tiger, was recognized as being in danger of extinction in 1936. In September of the same year, the last known Thylacine died, and no Thylacine tigers have been confirmed spotted since, according to List Verse. Another tiger that has gone extinct is the Javan tiger on the Indonesian island of Java. Javan tigers went extinct in the 1980s due to agricultural encroachment and habitat loss. The Caribbean monk seal is another animal that is now extinct due to habitat loss, as well as human hunting. The monk seal was the only seal native to the Caribbean Sea and the Gulf of Mexico until the species was declared extinct in 2008. There are some species that went extinct for unknown reasons such as the Liverpool pigeon that lived in Tahiti, according to Mother Nature Network. The Liverpool pigeon species was assessed by the International Union for Conservation of Nature in 2008 when it was declared to be extinct.