Nurse Sharks Sleep Together

The nurse shark is either named after the sucking noise it makes when hunting for prey that sounds like a nursing baby.Or it may derive from either the word, nusse, which means ‘cat shark’ or the Old-English word hurse, which means sea-floor shark. Either way this shark is less threatening then many of its relatives; however, it is extremely large, growing up to 14 feet in length. Nurse sharks are nocturnal and sleep during the day on the sea floor, in groups of 40 or so. Sometimes they’re even piled on top of each other.