21Irish Elk
The Irish Elk, an extinct species of deer that had the largest antlers of any known deer with a maximum size of 3.65m (12 foot) from tip to tip that weighed up to 40kg (88lb).
22West African black rhino
The once widespread West African black rhino was declared extinct in 2011. The reason for extinction was poaching by humans.
23Tasmanian Tiger
The extinct Tasmanian Tiger could open its mouth wider than any other mammal.
