Tagging the whales to study their behavior

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Mark Johnson, an engineer at Woods Hole Oceanographic Institution, is poised to attach a D-tag to a pilot whale off the island of El Hierro in the Canary Islands. Johnson, who developed the non-invasive tag to record whale movements and sounds in the deep, is co-author of a study (published online in May 2008) that used D-tags to reveal the distinctive way that pilots whales hunt.