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
Birds International the Conference of the Parties all of its requests for registration were rejected based on the grounds that the birds in question were not native to Philippines and the company could not verify the legality of its acquirement of their breeding stocks. However the vote was a close one, members of the European Union supporting registration and some countries that are the homelands of birds in question objecting. Had the request been approved Birds International would have been able to commercially trade the following birds: Goffin's cockatoo of Indonesia, yellow crowned amazon parrot of Central and South America, yellow headed