Divers clutch wooden spears as they hunt hordes of hungry starfish destroying the coral reefs around the Cook Islands already weakened by climate change.

Deep in the underwater world, animals like starfish use unusual ways to escape predators. In an act called autotomy, starfish shed one or more of their limbs to flee their hunters. The severed, ...

The star shape of the starfish (five arms) is intriguing to many marine aficionados. But how it came to be is a question not many can answer. It is due to a gap in the fossil record of echinoderms, ...