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What if snakes were large enough to attack hippos? What if elephants were the size of dogs? In prehistoric times, they were! Except for their size, lots of prehistoric beasts looked similar to modern animals that live on Earth. A rat could be as big as a buffalo, the giant devil frog could eat newborn dinosaurs, and dragonflies were the size of a small hawk. If these extinct beasts came to life, they might look familiarbut you wouldn't want to get in their way! Learn more about the incredible and terrifying prehistoric ancestors of modern animals.