Chimney Swifts have feet so small that they can’t perch. Instead, they cling to the sides of vertical structures. Swifts used to live in the giant trees of old-growth forests, but after these were cleared, they adapted to live in chimneys. Today, that habitat is disappearing, too…

Chimney Swifts have feet so small that they can’t perch. Instead, they cling to the sides of vertical structures. Swifts used to live in the giant trees of old-growth forests, but after these were cleared, they adapted to live in chimneys. Today, that habitat is disappearing, too…