Last week, Mark told you about a giant eyeball that washed up on the beach in Florida. Today, the Florida Fish and Wildlife Conservation Commission released their preliminary analysis of who that eyeball once belonged to and how it likely ended up becoming the temporary toast of the Internet.

The Deep Sea News blog called it last week, but the official word from the experts is that this was the eye of a swordfish. The distinction is based on the size, the color, and the fact that there are bits of bone present around the edges (something you wouldn't see attached to a giant squid eye).

How do you get a swordfish eye without a swordfish attached? Simple: It's swordfish season. In the press release, Joan Herrera, curator of collections at the FWC’s Fish and Wildlife Research Institute in St. Petersburg, said that, "Based on straight-line cuts visible around the eye, we believe it was removed by a fisherman and discarded."

But before we pack this mystery away, I think you should take one more close look at the giant eyeball, because it offers a great view a really interesting feature of fish eye anatomy. Fish eyes are similar to those of land-dwelling vertebrates. But there are some key differences. In particular, the shape of the lens...

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