The green urchin and the pencil urchin are alike in many ways, but their differences matter in a big way when it comes to their ecological impacts. We originally posted this episode at the New York Times, where you can read more- nytimes.com/2014/02/26/science/two-urchins-similar-but-not.html

Made by Sofia Castello y Tickell, a research assistant, and Robert Lamb, a graduate student. Both are in Jon Witman's laboratory (witmanlab.com).The music is by Jahzzar, freemusicarchive.org/music/jahzzar/home/railroads_whiskey_co .

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