7 “The brittle star can regenerate the arm in just a month, which is very, very fast,” said Parey. In comparison, sea stars take up to a few months to regrow a lost arm, making brittle stars an ...

The gray sea star can grow up to 12 inches long and they also have the ability to regenerate an arm if they lose it. Like we said before, there is no telling what you will find while on the beach.