Penis envy

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In honor of Darwin Day, I'd like to give a little shout out to some of Charles Darwin's contributions to marine science.
...said Charles Darwin, more than any man ever has. He should have, too - he spent seven years of his life working up the first encyclopedic monograph on the group. But that pales into insignificance compared to Alan Southward, who died last year.
Ed Yong over at Not Exactly Rocket Science ha an awesome post highlighting recent research on the unique vision of mantis shrimps.