. Animals of land and sea. Zoology; Insects; Zoology. THE FOOD OF THE OTHER LAND ANIMALS 89 seeds; but if they see another bird, as a cardinal, eating them they will promptly follow suit. The flight of birds gives them a very great advantage in the search for food. As birds cannot hibernate and require a very large amount of food in proportion to their weight on ac- count of their great activity and high tem- perature, which is normally as much as ° in some, the colder regions would be almost birdless were it not that the birds are able, when the waters freeze and the land life passes int
. Animals of land and sea. Zoology; Insects; Zoology. THE FOOD OF THE OTHER LAND ANIMALS 89 seeds; but if they see another bird, as a cardinal, eating them they will promptly follow suit. The flight of birds gives them a very great advantage in the search for food. As birds cannot hibernate and require a very large amount of food in proportion to their weight on ac- count of their great activity and high tem- perature, which is normally as much as ° in some, the colder regions would be almost birdless were it not that the birds are able, when the waters freeze and the land life passes into the winter con- ditions, to fly south- ward to regions where they can still find abundant food. Trop- ical birds of many kinds also wander about over more or less definite tracks at different seasons. There are various types of parasitic birds which live by robbing other birds. IMost, but not all, of the Old World cuckoos, though only one of the American so far as known, lay their eggs, or rather place them, in the nests of other smaller birds; the young cuckoo, shoving the other young birds out of the nest, is reared by the foster parents. The. Figs. 99-104. ]Moths. For explanations of the figures see p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clark, Austin Hobart, b. 1880. New York, D. Van Nostrand company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecti, booksubjectzoology
