Millions of Jellyfish-like 'Sailor' Creatures Invade West Coast Beaches

Breaking News Emails

Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.
/ Source: Live Science

An invasion is afoot along beaches from Oregon to California: Millions of glassy purple, jellyfish-like sea creatures that look like sailboats have been washing ashore.

Known as "by-the-wind sailors," they typically live in the open ocean, but when warm water and storms draw them near shore, the wind blows them onto beaches, where they die in stinking piles.

The tiny sea creatures, called "by-the-wind sailors," washed ashore in Humboldt, California (above) and other beaches along the West Coast.M. Sid Kelly / YouTube screenshot

These creatures, whose scientific name is Velella velella, aren't actually jellyfish, but hydrozoans, related to the Portuguese man-of-war. Yet unlike man-of-war, they don't sting humans, though authorities don't recommend touching your face or eyes after handling them.

Let our news meet your inbox. The news and stories that matters, delivered weekday mornings.

Each little sailboat, measuring about 2.75 inches (7 centimeters) long, is in fact a colony of hundreds of smaller organisms, each with a specialized function such as feeding or reproduction, researchers say. [See Amazing Photos of Jellyfish Swarms]

"They sit at the surface of the ocean and have little sails," and their movement depends on which way the wind is blowing, said Richard Brodeur, a fishery biologist at NOAA Fisheries' Newport, Oregon, research station.

Most of the time off the coast of Oregon and California, the winds are blowing toward the South, into the open ocean, Peterson said. But when big storms sweep out of the southwest — like one that hit California two weeks ago — it blows these living flotillas onto the beaches, he said. There, they usually die, giving off a bad smell as they rot, he added.

Tons of the nautical creatures can be found at sea, but they don't always come ashore, Brodeur told Live Science. But recently, huge numbers of them have been washing up on land.

— Tanya Lewis, Live Science

This is a condensed version of a report from Live Science. Read the full report. Follow Tanya Lewis on Twitter and Google+. Follow us @livescience, Facebook & Google+.

More from Live Science: