curl-6 on 20 April 2018
Some of my top picks:
Titanoboa, the biggest known snake to ever live
Giant Moa, which survived as recently as the 1500s
Thylacine/Tasmanian Tiger, survived until the 20th century
Woolly Rhinoceros, a resident of the more recent Ice Ages
Basilosaurus, a predatory whale 15-18 meters long