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
Carry On Screaming! Screaming" (film version only) was credited as "Anon" and was thought to have been sung by Jim Dale, who appears in the film. The singer is actually Ray Pilgrim, a session singer who sang for the Embassy label. A vinyl 45 rpm version of the song was also released in 1966 (Columbia DB 7972) by vocalist Boz Burrell, before he became bassist for the bands King Crimson and Bad Company. Charles Hawtrey was added to the cast at the eleventh hour, after American distributors specifically requested him, as he was such a hit and crowd-pleaser with audiences there. He replaced