Found among the shallow reefs of the Caribbean Sea, these squid have three hearts and blue blood. | National Geographic

Close encounters- Caribbean reef sharks, Carcharhinus perezii, are one of the more common sharks seen by snorkelers and divers on the coral reefs in the Florida Keys. This one was spotted near the surface at Looe Key, in the Florida Keys National Marine Sanctuary and a few miles south of the National Key Deer Refuge. In the video you can observe just how hydrodynamic and powerful these animals are; a flick of the tail sends her off to investigate the yellowtail snappers who seem to have located