(sorry this is extremely late! it apparently didn't publish :(
How Snakes Lost Their Legs
About 150 million years ago, snake used to roam around on legs. Now, scientist have located the process in which snakes evolved into having none. Some snakes retain tiny vestiges of legs that are a couple small bumps on either side of their pelvis. Apparently a specific gene in them switches on and off through their embryotic stage of development. Read More About It!!
http://www.npr.org/sections/thetwo-way/2016/10/20/498575639/how-snakes-lost-their-legs
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