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Global shark populations have declined more than 70% since 1970, researchers say
WASHINGTON (AP) - When marine biologist Stuart Sandin talks about sharks, it sounds like he’s describing Jedis of the ocean. "They are terrific predators, fast swimmers and they have amazing senses — they can detect any disturbance in the ocean from great distance," such as smells or tiny changes in water currents.Their ability to quickly sense anything outside the norm in their environment helps them find prey in the vastness of the open ocean.