Thousands of Vaux's Swifts pass through Portland annually on their migratory journey south. Every night in September at sunset, these birds amazingly come into a tornado-like formation and funnel down into the chimney at Chapman School to roost for the night.
Vaux's Swifts are closely related to the hummingbird. They have tiny legs and feet which allow them to perch on vertical surfaces but not on branches. As such, they spend most of their life "on the wing". They eat, mate and even pick up items for their nests while flying.