. Animal activities : a first book in zoölogy. Zoology; Animal behavior. 230 ANIMAL ACTIVITIES. in many cases even changing with the seasons to afford a better protection. The arctic fox and the northern hare become near as white as snow in winter. It has been found that the fact that most animals are Hghter in color beneath than above is really a device for con- cealing them. Horns. These defensive weapons are formed from the epidermis in much the same way as hair. In. 1 Fig. 193.—I, horns of sheep; 2, horns of cow; 3. horns of deer. domestic cattle the horns have an interior core of bone ove
. Animal activities : a first book in zoölogy. Zoology; Animal behavior. 230 ANIMAL ACTIVITIES. in many cases even changing with the seasons to afford a better protection. The arctic fox and the northern hare become near as white as snow in winter. It has been found that the fact that most animals are Hghter in color beneath than above is really a device for con- cealing them. Horns. These defensive weapons are formed from the epidermis in much the same way as hair. In. 1 Fig. 193.—I, horns of sheep; 2, horns of cow; 3. horns of deer. domestic cattle the horns have an interior core of bone over which the skin of horn fits. The horns of deer are solid, but in the velvet are covered with epidermis. They fall off each autumn and grow again in the spring. Structure of Teeth. The teeth of mammals are composed chiefly of a bony substance called dentine,. 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 French, Nathaniel S. (Nathaniel Stowers), 1854-. New York ; London : Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecta, booksubjectzoology
