by Abbie Farwell Brown
The Curious Book of Birds
The dove and the wrinkled little bat once went on a journey together. When it came toward night a storm arose, and the two companions sought everywhere for a shelter. But all the birds were sound asleep in their nests and the animals in their holes and dens. They could find no welcome anywhere until they came to the hollow tree where old Master Owl lived, wide awake in the dark.
"Let us knock here," said the shrewd bat; "I know the old fellow is not asleep. This is his prowling hour, and but that it is a stormy night he would be abroad hunting. What ho, Master Owl!" he squeaked, "will you let in two storm-tossed travelers for a night's lodging?"
Birds are warm-blooded vertebrate animals that have wings, feathers, a beak, no teeth, strong hollow bones, a skeleton in which many bones are fused together or are absent, powerful flight muscles, and an extremely efficient, one-way breathing system.
Most birds can fly. Birds have a very strong heart and an efficient way of breathing - these are necessary for birds to fly. Birds also use a lot of energy while flying and need to eat a lot of food to power their flight.