A flight of White-collared Swifts, huge swifts the size of small falcons, wing their way toward a small waterfall in Southern Mexico. Flying up to 100 miles per hour, they slice right through the waterfall into the cave beyond. White-collared Swifts are found from Mexico to Brazil. By day, they fly high above ground, in search of flying insects, gliding and soaring on outstretched wings, rarely flapping. And not once do they perch until returning through the veil of water and into the cave. Here they also nest, on a ledge just beyond the waterfall, their nests enshrouded by mist. Learn more at BirdNote.org.