• Chimney Swifts do not perch. Instead they use their long claws to cling to the walls of chimneys and other vertical surfaces.
• The Chimney Swift looks a little strange as it flies. It appears to be beating only one wing at a time. Studies, however, have shown that it actually beats both wings. The illusion is due to the erratic nature of its flight with all the banks and turns.
• These birds fly constantly. They are almost always on the wing except when they are at the nest or on the roost at night. They even bathe in flight by flying low over a body of water, touching the water with their chest and then shaking the water from their feathers.
• A group of swifts are collectively known as a "box", "flock", "screaming frenzy", and "swoop" of swifts.