A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

aggression ampullae of lorenzini animal animal themes animals in the wild apex predator aquatic atlantic biology blue blue shark carcharhinidae carcharhiniformes carnivore cartilaginous fish chatham chondrichthyes chum color image danger day dorsal fins elasmobranch fierce fish front view full length habitat horizontal hydrodynamics ichthyology marine biology massachusetts motion natural light nature nauset beach new england no people ocean olfaction ominous on the move one animal orleans outdoors pectoral fins photography predator prionace glauca requiem sharks sea sea life shark sight sleek species sunlight swimming temperate tropical climate undersea underwater water wellfleet wilderness wildlife zoology