Lecture: Bird Bills
Bird bills come in all sorts of sizes and shapes, from the needle-like bills of swallows for picking insects out of the air, to hummingbirds' long and curved bills for probing into the base of a flower, to the robust bill of the evening grosbeak for cracking into seeds. Some even have special features, like pressure sensors that allow shorebirds to detect food without touching it. The Arnold Arboretum invites you to join Dr. Lorna…