Titanoboa
We’re cautious of large snakes, especially poisonous ones. The Titanoboa is one of the creepiest extinct animals on this list. It’s a large snake that now lives in what we call northeastern Colombia. In fact, they were so big, they grew to be up to 47 feet long, and weighed over 2,500 pounds. It lived during the Paleocene Epoch, 60 to 58 million years ago, following the extinction of the dinosaurs. It’s considered to be the largest member of the suborder Serpentes. Luckily, it mostly preyed on fish, so if we did exist during this time period, we wouldn’t have to worry about getting eaten by one of these terrifying creatures (Wikipedia).