Classical conditioning has been demonstrated in a handful of previous studies in starfish. But most echinoderms -- a group of some 7,000 species that includes brittle stars and similarly brainless ...

An curved arrow pointing right. Scientists were observing a field of brittle sea stars off Jarvis Island when they saw something they never expected: One of the brittle stars snatched a squid ...

Like many other echinoderms, brittle stars can regenerate their limbs following amputation. 7 “The brittle star can regenerate the arm in just a month, which is very, very fast,” said Parey. In ...

Biologists have discovered that brittle stars—a sea creature with no brain—can still learn things, but we don't know how. Brittle stars are relatives of the starfish, and similarly ...