How do crabs breathe?

Did you know there are thousands of different species of crabs on Earth? Most of them live in water, but there are plenty of species that can live outside the water, too. So how do crabs breathe, both in the water and on land? We asked biologist and science communicator Sarah McAnulty to help us find the answer.Got a question that’s got you feeling crabby?  Send it to us at BrainsOn.org/contact, and we’ll write you an answer on our finest cruSTATIONERY.