. The children's book of birds . gree upon a piece of woods, and 60 THE BIRD GROWN UP all the crows for miles around come there everynight. Sometimes thousands sleep in this onebedroom, called a crow roost. Robins do thesame, after the young are big enough to fly sofar. Audubon, who has told us so much aboutbirds, once found a hollow tree which was thesleeping - room of chimney swifts. The noisethey made going out in the morning was like theroar of a great mill-wheel. He wanted to see the birds asleep. So in thedaytime, Avhen they were away, he had a piececut out at the foot of the tree, big e
. The children's book of birds . gree upon a piece of woods, and 60 THE BIRD GROWN UP all the crows for miles around come there everynight. Sometimes thousands sleep in this onebedroom, called a crow roost. Robins do thesame, after the young are big enough to fly sofar. Audubon, who has told us so much aboutbirds, once found a hollow tree which was thesleeping - room of chimney swifts. The noisethey made going out in the morning was like theroar of a great mill-wheel. He wanted to see the birds asleep. So in thedaytime, Avhen they were away, he had a piececut out at the foot of the tree, big enough to lethim in, and then put back, so the birds wouldnot notice anything unusual. At night, after the swifts were abed, he tooka dark lantern and went in. He turned thelight upon them little by little, so as not to startlethem. Then he saw the whole inside of thetree full of birds. They were hanging by theirclaws, side by side, as thick as they could thought there were as many as twelve thoifsand in that one XV HIS TRAVELS Most of our birds take two long journeysevery year, one in the fall to the south, and theother in the spring back to the north. Thesejourneys are called migrations. The birds do not go all at once, but in manycases those of a kind who live near each othercollect in a flock and travel together. Eachspecies or kind has its own time to go. It might be thought that it is because of thecold that so many birds move to a warmer cli-mate. But it is not so; they are very welldressed to endure cold. Their feather suits areso warm that some of our smallest and weakestbirds are able to stay with us, like the chickadeeand the golden-crowned kinglet. It is simplybecause they cannot get food in winter, that theyhave to go. The fall travel begins soon after the first ofJuly. The bobolink is one of the first to leaveus, though he does not start at once on his long 62 THE BIRD GROWN UP journey. By that time his little folk are fullgrown, and can take care
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