Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

nurse sharks ginglymostoma cirratum belize underwater marine life biodiversity ocean social behavior ecology sea grass aquatic habitat coral reef conservation biology creatures environment shark species wildlife floor tropical waters ecosystem swimming oceanic exploration tourism snorkel scuba diving nature animals snorkeling environmental awareness science world shallow water fish clarity