There are some horrible animals out there... and in this video we'll show you five of the worst!

Have you ever heard of the golden poison dart frog? Or the box jellyfish? They're both pretty scary animals and once Rattus tells you about them you might not be able to forget!

There’s even a pufferfish that people eat and, unless prepared correctly, can kill you! Would you dare try this dangerous dish? Just a spoonful? No…?

Horrible Histories: Rotten Romans is in cinemas July 26th!