Thousands of small sea creatures called Velella velella are invading Bay Area beaches. Here's why and what to do if you come across them. MARIN COUNTY, Calif. -- Have you seen them?

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"I've never seen so many here on this beach." The weird-looking organisms are cousins to jellyfish but only an inch or two long, they're called Velella velella otherwise known as By-The-Wind-Sailors.