In April, Aaron Knight flew a small plane along the shore of South Monomoy Island off the Chatham coast, taking an aerial video of a seal-lined beach below him.

Among the many who saw the film on Facebook was Peter Trull, field naturalist, author and a seventh-grade science teacher at Cape Cod Lighthouse Charter School in Harwich. Like everyone, he was amazed. One Facebook post quipped there appeared to be “trillions of seals.”

Maybe not trillions, but the images did beg the question, how many?

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