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Baby chimney swifts are altricial—naked, blind and helpless when they hatch. Fledglings leave the nest after a month. [57] The average chimney swift's life span is 4.6 years, [60] but one is known to have lived more than 14 years. It was originally banded as an adult, and was recaptured in another banding operation some 12.5 years later. [61]
Thousands of birds flock in great living tornados, then funnel into the chimney. Estimates of 1,700 to 35,000 swifts have been reported in various years. Shortly after sunset, over a period of roughly 30 minutes, they fly into the top of the brick chimney (constructed c.1925) to roost on the interior surface until they depart at sunrise. [8]
Swifts are among the fastest of birds in level flight, and larger species like the white-throated needletail have been reported travelling at up to 169 km/h (105 mph). [7] Even the common swift can cruise at a maximum speed of 31 metres per second (112 km/h; 70 mph).
These birds have very short legs and never settle voluntarily on the ground, perching instead only on vertical surfaces. Many swifts have very long, swept-back wings which resemble a crescent or boomerang. Four species have been recorded in Wyoming. Black swift, Cypseloides niger; Chimney swift, Chaetura pelagica; Vaux's swift, Chaetura vauxi (A)
Pale-rumped swift (Chaetura egregia) Chimney swift (Chaetura pelagica) Vaux's swift (Chaetura vauxi) Chapman's swift (Chaetura chapmani) Ashy-tailed swift (Chaetura andrei) Sick's swift (Chaetura meridionalis) Short-tailed swift (Chaetura brachyura) Tribe Apodini - typical swifts Genus Aeronautes; White-throated swift (Aeronautes saxatalis)
The swifts are small birds which spend the majority of their lives flying. These birds have very short legs and never settle voluntarily on the ground, perching instead only on vertical surfaces. Many swifts have very long, swept-back wings which resemble a crescent or boomerang. Black swift, Cypseloides niger; Chimney swift, Chaetura pelagica
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These birds have very short legs and never settle voluntarily on the ground, perching instead only on vertical surfaces. Many swifts have very long, swept-back wings which resemble a crescent or boomerang. Four species have been recorded in Utah. Black swift, Cypseloides niger; Chimney swift, Chaetura pelagica (A) Vaux's swift, Chaetura vauxi