A Hawaiian family spotted this whale shark while free-diving off the coast of Lanai. First, they were excited about the rare sighting of the 20-foot-long endangered shark. But then, they noticed a heavy rope tightly wrapped around its neck. Biologists Kapua Kawelo and Joby Rohrer decided to help the animal, while their son, 17-year-old Kanehoalani, filmed the rescue. ➡ Subscribe: About National Geographic: National Geographic is the world’s premium destination for science, exp
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