When mentioning large, extinct animals, most people automatically think about T-Rex and the gang, considering dinosaurs as the largest beasts that ever roamed the Earth. What you may not know, however, is that there were a huge number of imposing giant mammals, birds and reptiles that may have been equally impressive. Let's take a look at a few of them.
1. The Smilodon
Although, compared to a few other members on this list, the Smilodon wasn't technically a giant, it was one of the largest, most feared predators of its time. This saber-toothed cat weighed 500 lbs on average (more than some of the largest tigers on Earth today), and its large canines allowed it to dominate the wild for about 2 million years.