You will often see, and hear, several Chimney swifts in flight together.
It is very rare to see a Chimney swift nest.
This weeks "Bird of the Week" is the Chimney swift. A "flying cigar," the Chimney Swift is rarely seen perched. Its high-pitched twittering is a familiar sound during summertime as it flies high above, catching small flying insects. The Chimney swift has a fast, erratic flight. They are among the most aerial of birds, flying almost constantly except when at the nest or roosting at night. The Chimney Swift bathes in flight, gliding down to water, smacking the surface with its breast, then bouncing up and shaking the water from its plumage as it flies away. Chimney swifts feed on flying insects by pursuing the flying insects and catches them in their bill. They feeds in flocks or alone. Chimney swifts can devour over 1,000 insects in a day!
It's nest is a half saucer of woven small twigs held together with saliva. It's glued with saliva to inside wall of chimney.