Living Fossils: Part I
Recommend
Some animal species have gone unchanged for millions of years and continue to thrive on earth. Animals like the horseshoe crab have led scientists to look at other animals and wonder what they... (more info)

Some animal species have gone unchanged for millions of years and continue to thrive on earth. Animals like the horseshoe crab have led scientists to look at other animals and wonder what they evolved from.

Related Article: Learn more about extinct animals.

most watched: extinct animal videos