reat differences in individual singers.

The nest is bulky, composed of twigs, rootlets, dead leaves, strips of
bark, etc. Strips of grapevine bark are quite commonly used, some
nests being constructed almost wholly of this material. The eggs are
generally four in number and of a greenish blue, unmarked.

[Illustration: CATBIRD]

BLUEBIRD (_Sialia sialis_)

Length, six and one-half inches; extent, twelve and one-half inches.
The upper parts, wings, and tail are bright blue; sides of the head
and upper part of chin also blue; throat, breast, and sides, reddish
brown; abdomen and under side of tail, white; legs and bill, blackish;
eye, brown. The female is similarly marked, but the colors are duller.

The bluebird's song is a continued pleasing, rich warble.

The nest is loosely built of grasses, feathers, and soft material, in
holes of trees, in hollows of posts, or in bird boxes. The eggs are
light blue and are four or five in number.

[Illustration: BLUEBIRD]

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Charles Almanzo Babcock

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