. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds. Birds; Birds. UTILITY OF BIRDS IN NATURE. sued from afar by others still, until a feathered host con- centers from the sky upon the carrion feast. Birds are lower in the organic scale than the class of mammals which includes man, the four-footed animals, and even the seal and the whale. Birds are closely allied in structure to reptiles. The earliest bird known, the Archpe- op
. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds. Birds; Birds. UTILITY OF BIRDS IN NATURE. sued from afar by others still, until a feathered host con- centers from the sky upon the carrion feast. Birds are lower in the organic scale than the class of mammals which includes man, the four-footed animals, and even the seal and the whale. Birds are closely allied in structure to reptiles. The earliest bird known, the Archpe- opteryx, had teeth, two fingers on each wing, and a long rep- tilian tail adorned with feathers. Still, notwithstanding the comparatively low place which is given by the systematists to birds, their physical organiza- tion excels in some respects that of all otheranimals. They surpass all other vertebrate animals in breathing power or lung capacity, as well as in muscular strength and activ- ity. Ifae tempera- pig. Archjeopteryx, a bird with teeth. Ee- ture of the blood is stored from the Jurassic epoch. About one-flfth natural . size; after Chapman. higher in birds than in other animals, and the circulation is more rapid. To maintain this high temperature, rapid circulation, and great activity, a large amount of food is absolutely necessary. Food is the fuel without Avhich the brightly burnino- fires of life must grow dim and die away. Birds are, therefore, fitted for their function of aerial police not only by their powers of flight and perception, but also by their enormous capacity for assimilating food. When food is plentiful, birds gorge themselves, accumulating fat in quantities. Shore birds frequently become so fat during the fall migra-. 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 Forbush,
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherb, booksubjectbirds
