The house is all gone, but the chimney is as strong as ever--I can climb up top and look down at the nests inside.

See! there it is now!" Looking over the fence, they saw a tall stack of worn gray stones, that looked more like a tower than a chimney.
Small blackish birds kept streaming from the top, circling high in the air and darting down again, all twittering as they dropped one after another out of sight, inside the weather-beaten pile.
"Look, children!" said the Doctor.

"These are Chimney Swifts, usually called Chimney Swallows: and their color is like soot, to match the places they live in." "Aren't they any relations of Swallows ?" asked Rap.
"No, my boy; they look like Swallows, but as I think Olive told you once, the Swifts are a family all by themselves.

This one lives in the eastern half of the country in summer, and goes far south for the winter.

When he lives in a wild region, he chooses a hollow tree for his nesting place, as his ancestors always did before there were any houses or chimneys.
[Illustration: Chimney Swift.] "The flight of the Swift is so rapid that at times it is almost impossible for the quickest eye to follow him; his wings are very strong, and almost as long as all the rest of his body.