DeRuiter and Bahr had to make the tag small enough for harbor
porpoises’ bodies. And they had to find a way to make the tags stick to the
porpoises' smooth skin, which required designing and making new soft
suction cups. Above, they get ready to attach a hydrophone on top of a D-tag to make some recordings to calibrate the tag.
(Photo courtesy of Alexander Bahr, MIT WHOI Joint Program)[back]
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