Beelzebufo
We’ve seen many animals on this list, but one of the most terrifying extinct animals has to be the Beelzebufo, a prehistoric frog. It’s earned the name “devil frog”, “frog from hell”, and “devil toad”. Its remains were discovered in Madagascar, and can be traced to over 70 million years ago. It’s an incredibly large species of prehistoric frog, and even has short spines protruding from its back. They grew up to 16 inches and weighed 10 pounds, and existed 65 to 70 million years ago. It’s said they might have snatched lizards and even dinosaurs, and pretty much anything that happened to walk past them. We know this might not be terrifying for humans, but small creatures would be quaking. (Wikipedia).