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