Sometimes interpreting history is a tricky thing, especially when there is not any written or photographic evidence of what happened. 

Natural history can only be determined by clues that are left behind in the fossil record and that is often hit or miss. 

Sometimes living things disappear from one part of the fossil record and then turn up in another time and place alive and well.  These organisms are called Lazarus taxa by paleontologists. 

This video by the PBS Eons YouTube channel will shed more light on this phenomena and likely teach you a thing or two along the way. 

Don't forget to leave a comment below to let me know what you thought about the video!