NATURAL HISTORY MUSEUM OF LOS ANGELES COUNTY These blueish blogs that appear to have a sail aspect of their bodies are usually not able to live much longer once beached. They sting.
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These are marine hydrozoans, a group of animals closely related to jellyfishes. Interestingly, what might look like a single animal is actually a colony of multiple individuals working together. This is similar to the Portuguese man o' war, which is also a colonial hydrozoan. By-the-wind sailors feed on planktonic organisms using tentacles that have harpoon-firing cells called cnidocysts, just like jellyfish.
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