What is your favorite historical animal

Sabertooth Tiger, totally my jam! Those teeth are just ridiculously cool, and imagining them hunting is pretty wild.

Hard to pick just one, but I'd say Wojtek the bear, the Syrian brown bear who served with Polish soldiers during WWII. He carried ammo, boosted morale, and even got officially enlisted as a soldier. Pretty wild (and heartwarming) story for an actual war bear.