Facts about Brittle stars
Although ophiuroids resemble starfish, they are quite different from them.
First, they move with their flexible arms, whereas starfish use tube feet ...
Portuguese man-of-war are fascinating creatures, that are in fact a colony of individual organisms. Named after warship vessels, they resemble floating plastic bags, tinted with a bluish or pinkish hue. They are commonly found in the biggest oceans, except in the Arctic Ocean, and pose no threat to humans, but can sting painfully.