Ask any kid what his or her favorite prehistoric animal is, and you’ll probably get an answer like T. rex, Triceratops, or Stegosaurus. While those are certainly among the most popular, they aren’t the strangest creatures that paleontologists have dug up.

This video from list25 brings you the 25 most unusual prehistoric creatures scientists have ever discovered. From crazy elephant-like quadrupeds, to tiny spike-legged aquatic arthropods, to a giraffe-like pterosaur, the fauna of the prehistoric world looked a lot different than what we’re used to seeing. 

Check out the whole list here: