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8 species moving to cooler waters

By: Angela Nelson on Sept. 26, 2016, 6:15 a.m.
Red crabs washed up on a California beach

Photo: David Litman/Shutterstock

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Crabs

For the last two years, swarms of red crabs have been washing up on the beaches of Southern California. In June 2015, hundreds of thousands of these two-inch-long "tuna crabs" came ashore, though 2016 has seen fewer of them — about a thousand so far, according to National Geographic.

Pelagic red crabs usually live in waters off Baja California, but the warm currents of El Niño pushed them farther north in recent years. However, when they hit the colder water, they die off and end up on the sand.