 Engineer Mark Johnson (right) and biologist Peter Tyack work together to learn about whale behavior, using Johnson's D-tag to record whale movements, depth, and sounds on dives. Back in the lab, D-tag data tell the story of the whales' dives, from their swimming behavior to the kinds of vocalizations they use while foraging. (Photo by Tom Kleindinst, Woods Hole Oceanographic Institution)[back]
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