Lining Up Those Urchins for Noms

Via Elakha Alliance, which gives us a little science lesson today:

Is that really a purple sea otter skull?! Why, yes it is. This phenomenon is known as echinochrome staining. It occurs when sea otters consume copious amounts of echinochrome-containing prey items like sea urchins.

Photos by Peter Monteforte & Morro Bay State Parks