Caspian Horse
Considered to be gone by 700 AD however in 1965, they were rediscovered deep in the Elbruz Mountains. These gorgeous creatures can stand to 40 inches high, which is you, pretty all. Currently, Caspian Horses can be found all over certain parts of England and the United States.
Gilbert’s potoroo
Initially discovered back in 1841, thought extinct by 1909, and then rediscovered in 1994. There are only around 100 of these little guys left right now.