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Ten Things We’ve Learned about Sharks Since Last Shark Week

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Ten Things We’ve Learned about Sharks Since Last Shark Week
In light of Shark Week 2017, here are some revelations about the fearsome fish we’ve made in the past year

By Ben Panko
smithsonian.com
July 27, 2017


    As a group, sharks have been around for roughly 450 million years. But when it comes to individual lifespan, there's one species that appears to be the longest-lived vertebrates ever discovered. Unlike the tropical sharks many are familiar with, Greenland sharks live in the cold waters near the Arctic, giving them a slow metabolism rate that's "just above a rock," according to one shark researcher. This slow-motion living means they can survive for more than 400 years, but it also means that the sharks reproduce extremely slowly. This puts them at greater risk of extinction if many of them are killed off.

 http://www.smithsonianmag.com/science-nature/ten-things-weve-learned-about-sharks-last-year-180964221/

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