The swifts, in elevated space, act as the river's foil.
The trees provide shelter and nesting sites for birds such as starlings, whitethroats, swifts and linnets.
Many swifts have long swept-back wings that resemble a crescent or a boomerang.
Many swifts have very long, swept-back wings that resemble a crescent or a boomerang.
The most prominent of the species recorded are the species of waterfowl, wading birds, song birds, raptors, game birds, swifts and nighthawks and so forth.
Swifts are the masters of aerial feeding; they can fly for hours without perching.
Count estimates of 1,700 to 35,000 swifts have been reported.
They each do a series of sets, consisting of five quadrilles played at successively swifter tempos.
