1988 Press Photo Trumpeter swans in Minnesota, subject of NOVA program

Trumpeter swans recently were reintroduced in Minnesota for the first time in a century but they still knew when and where to migrate for winter. NOVA explores the mystery of where animals migrate, why and how they get there in "The Mystery of the Animal Pathfinders," airing Tuesday, November 25 at 8 pm on PBS.

Photo measures 10 x 8 inches. Photo is dated --1988.

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