Common swift that resemble a crescent or a boomerang. Their call is a loud scream in two different tone pitches, the higher of which issues from the female. They often form 'screaming parties' during summer evenings, when 10–20 swifts will gather in flight around their nesting area, calling out and being answered by nesting swifts. Larger "screaming parties" are formed at higher altitudes, especially late in the breeding season. The purpose of these parties is uncertain, but may include ascending to sleep on the wing, while still breeding adults tend to spend the night in the nest. Swifts may nest in former
Screaming by teaching assistant Jill Drake in 2000. Screaming A scream, shout, yell, shriek, hoot, holler, vociferation, outcry, bellow, or raising one's voice, is a loud vocalization in which air is passed through the vocal folds with greater force than is used in regular or close-distance vocalisation. This can be performed by any creature possessing lungs, including humans. There are slight differences in meaning among them; for example, "scream" and "shriek" generally refer to a higher-pitched, sharp sound, used by some birds and other animals, and a "hoot", such as emitted by an owl, usually does not involve words. A scream