 In one tracking study, a single immature nursehound was observed to use five different refuges in succession over a period of 168 days, consistently returning to each one over a number of days before moving on.Nursehounds may occupy refuges to hide from predators, avoid harassment by mature conspecifics, and/or to facilitate thermoregulation.In captivity, these sharks are gregarious and tend to rest in groups, though the individuals comprising any particular group changes frequently.