. The birds of Illinois and Wisconsin . e Chimney Swift is a common summer resident in Illinois andWisconsin, usually aiTiving in April and leaving for the south inSeptember or early in October. Nests in chimneys and hollow trees. The nest is made of twigsglued together and fastened to the side of the chimney or tree bysecretion from the birds salivary glands. The eggs are white, usuallyfive or six, and measure about .85 x .50 inches. Nidification usuallycommences in May. Jan., 1909. Birds of Illinois and Wisconsin—^Cory. 527 Suborder TROCHILI. Hummingbirds. Family TROCHILID^. Hummingbirds. Hu
. The birds of Illinois and Wisconsin . e Chimney Swift is a common summer resident in Illinois andWisconsin, usually aiTiving in April and leaving for the south inSeptember or early in October. Nests in chimneys and hollow trees. The nest is made of twigsglued together and fastened to the side of the chimney or tree bysecretion from the birds salivary glands. The eggs are white, usuallyfive or six, and measure about .85 x .50 inches. Nidification usuallycommences in May. Jan., 1909. Birds of Illinois and Wisconsin—^Cory. 527 Suborder TROCHILI. Hummingbirds. Family TROCHILID^. Hummingbirds. Hummingbirds are peculiar to America, ranging from Alaskato southern South America. More than 400 species are recognized,most of which are restricted to tropical parts of South and CentralAmerica. Some 18 species occur in North America, but only one isfound in eastern United States. When flying the rapid movementsof the wings produce a distinct humming sound. The food consistslargely of insects, but they also eat the juices of >^
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