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Takes a Licking and Keeps on Clicking

WHOI engineer Tom Hurst (pictured) and his colleague Mark Johnson created a customized attachment for using digital tags, or D-tags, to track the movements, behaviors, and vocalizations of manatees. The tag is designed to be non-invasive; it could fit on a slice of sandwich bread and weighs about as much as a cell phone. (Photo by Tom Kleindinst, Woods Hole Oceanographic Institution)