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Mark Johnson preparing to attach a DTAG to a pilot whale.

Mark Johnson preparing to attach a DTAG to a pilot whale.
Mark Johnson preparing to attach a DTAG to a pilot whale.
Mark Johnson preparing to attach a DTAG to a pilot whale.
Mark Johnson preparing to attach a DTAG to a pilot whale.
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Mark Johnson preparing to attach a DTAG to a pilot whale.
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06/01/2003
whale tagging_Victor Gonzalez Otaola_C.1.jpg
Date is approximate.
Caption from Oceanus magazine, Vol. 46, No. 3, Pg. 37:
Mark Johnson, an engineer at Woods Hole Oceanographic Institution, designed the D tag, a noninvasive, temporary tag that records whale movements and sounds in the deep. Shown here, he is poised to attach a D-tag to a pilot whale off the island of El Hierro in the Canary Islands.
Courtesy of Mark Johnson
Copyright © Woods Hole Oceanographic Institution
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