Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
In spite of their apparent docile and rather dormant demeanor, I have heard of nurse shark bites when overly harassed - as in grabbing their tails, for example. Like stingrays, their usual defense is to run, but they are quite capable of inflicting pain.