Boston Globe | by Don Lyman, Globe Correspondent | Photo by Mark Lorenz for the Boston Globe | March 2, 2018

LAWRENCE — Sitting in their station wagon atop a hill in the Immaculate Conception Cemetery on a cold, windy afternoon, Dana Duxbury-Fox and her husband, Bob Fox, scan the sky with binoculars.

Suddenly, hundreds of crows begin to appear, flying in from different directions to their nightly roosting sites.

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