Physalia utriculus

Rarity: Common

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What Wikipedia says

Physalia utriculus, also called bluebottle or Indo-Pacific Portuguese man o' war, is a marine hydrozoan of the order Siphonophorae found in the Indian, Atlantic, and Pacific Oceans. A gas-filled bladder allows it to float on the surface, propelled by currents, tides, and by a sail at the top of the bladder.

Excerpt from the Wikipedia article “Physalia utriculus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NaNuu Michael Fried, CC0, via Wikimedia Commons.