In the starkness of winter, squirrel dreys reveal themselves in the tree canopy. They’ve been there all along — just screened by trees’ leafy crowns for much of the year. Dreys are shaggy masses of leaves nestled against a tree trunk or cupped in a fork of branches 20 to 40 feet above the ground. Squirrels not only rear their kits in them but also use them as shelter during many months of the year.
