Although Swifts and swallows are very similar in appearance, they are not even relatives: swallows belong to the group of sparrows and Swifts to the squad stereopanic (or winged). In addition, the swallow as flyer not hold a candle to the swift! Swift is the champion among all birds in flight speed (120-160 km/h), the swallow is flying much slower speeds of 50-60 km/H. swift flies fast and straight, but loses the swallow in flight maneuverability.
Typical external differences between the Swifts and swallows a lot.
The Swifts and swallows varies the structure of the feet. The swallows, as any other bird, three fingers pointing forward and one back. The swift all four fingers on the foot pointing forward. This foot will not stay on the line, but it as a climbing hooks, you can catch the slightest protrusion or crack on a vertical surface, wood or stone. So if you see a little bird with a forked tail, sitting on Telegraph wires can be no doubt that this is not the Swifts and swallows.
However, to discern the foot of the birds, it is necessary to get very close or even to catch her. How to distinguish between swift and swallow in flight?
The swallows breast white, and the Swifts only white dot under the beak. Therefore, flying swift you can see a dark abdomen, and swallows white.
Swift, unlike swallows in flight never folding the wings.
Swifts are different from swallows loudness. In flight, they constantly and loudly scream.
Swift larger than swallows, his wings already, but much longer and have a Crescent shape. The tail of the swift wider and shorter.
Swallows are more common in rural areas, and the Swifts in the city.
Did you know that...
Due to the fact that swift will never find sitting on the ground, arose a false opinion that swift is not able to take off from land, and therefore it does not shrink. It is not true: if for some reason the swift is on the ground, then takes off with it as easily as the swallow, with an unusually strong strokes of his long wings. And on earth swift will not meet simply because there is nothing to do. He eats, catching insects from the ground in flight, catching their wide mouth. Here is another "story" about the Swifts: if they fly with an open beak and mechanical catch anything edible that gets in the way. Actually they are, of course, hunting with my mouth closed. Seeing prey, they fly to it and only in the penultimate moment widely open beak ("penultimate"because, flying too close to the prey, alert, swift stops to see her!).