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Jessica Rinaldi For The Boston Globe
Scientists do not know much about the region’s gray seal population — how large it is, for example, or where the seals spend most of their time.
For the first time, the seals are being tagged and tracked, according to the researchers, who came from the US and Canada.
The team used a scalpel to clean glue off the sensors before releasing the animal at Chatham Harbor.
"We don't get access to animals like this very often, so you have to keep calm to perform the task," said Jerry Moxley, a doctoral student at Duke University.
The researchers plan to tag nine seals and collect biological samples from up to 30 seals through Monday.
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