mercoledì 26 febbraio 2014

NYT Science: Two Urchins, Similar but Not

Two Urchins, Similar but Not
By CASEY DUNN

It’s easy to mix up green sea urchins and pencil sea urchins when you see them while scuba diving. But these two species live very different lives.

Published: February 26, 2014 at 5:00AM

via NYT Science http://nyti.ms/1hg1XBb