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This is Scientific American's 60-second science.

I'm Christopher in Taliatta.

Sharks aren't typically thought of as vegetarians, or even omnivores.

But about 10 years ago, scientists documented a dainty relative of the hammerhead shark, known as a bonnet head shark, consuming copious amounts of seagrass.

A lot of people kind of just thought that, oh, the sharks

were consuming it incidentally while they're going after crabs and squid and other little

invertebrates that live in the seagrass meadows. Samantha Lee, a PhD candidate at the University

of California, Irvine. So everyone thought they were kind of just passing it through their system

and not really getting anything from it. So Lee and her colleagues hauled five of the small sharks

back to a Florida lab, and they put them on a three-week diet, 90% seagrass, 10% squid. And they

analyze the digestability of that diet. Turns out the sharks actually put on pounds and were able to digest the seagrass just

about as well as young green sea turtles do. Even though the bonnet head shark has what

scientists would deem as a carnivorous gut, they are definitely acting like omnivores. So there's

definitely something going on on probably a microbial level that's helping them to break down this

seagrass. The full nutrition info is in the proceedings of the Royal Society B. The study also

gives coastal ecosystem managers something new to chew on. These sharks are like lawnmowers,

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