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Unladen Swallows are small birds; about 7-8in in length (17-20cm), with a wing span reaching 12-14 (30-35cm).
Compare that to baby robins, which fledge when they are 14-16 days old and weigh over 50 grams! Swallows don't nest in trees. A swallow builds its nest on a barn rafter, bridge overhang, or other structure well off the ground. If a baby swallow doesn't make a strong first flight, it will crash on the ground. In order to survive this first flight, a swallow fledgling must have strong wings. That's why it starts exercising, flapping its little wings hard, by the time it's 9 days old.