. Types and breeds of farm animals. Livestock. THE PREHISTORIC HORSE 5 thereby increasing the length of stride and securing greater speed. The surfaces of the joints, at first more or less open and of the ball-and-socket type, changed to a grooved or pulley-like form, this limiting the direction of movement forward and back- ward,—a development better fitted for locomotion over level than rough ground. The horse being a grazing animal, the increase in height of body and length of leg necessitated elongation of neck and head. The natural habitat of the earlier horse was the. Fig. 3. Prejvalsky
. Types and breeds of farm animals. Livestock. THE PREHISTORIC HORSE 5 thereby increasing the length of stride and securing greater speed. The surfaces of the joints, at first more or less open and of the ball-and-socket type, changed to a grooved or pulley-like form, this limiting the direction of movement forward and back- ward,—a development better fitted for locomotion over level than rough ground. The horse being a grazing animal, the increase in height of body and length of leg necessitated elongation of neck and head. The natural habitat of the earlier horse was the. Fig. 3. Prejvalsky ponies in New York Zoological Park. Photograph by courtesy of Edwin R. Sanborn forest, where it undoubtedly subsisted on the more tender parts of plants and branches. In the course of time, however, along with the increase in size came the development of teeth with cutting and grinding surfaces better suited to the product of grassy plains than the forest; hence the horse eventually found its natural home on the open plain or meadow where grazing was afforded. The color of the prehistoric horse is not known, but it is sup- posed to have been more or less striped, like the zebra, though not brilliant in hue. The groundwork of this color was presum- ably dun, or khaki. „. ... ,, ... .^ •' ' Digitized by Microsoft®. 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 Plumb, Charles S. (Charles Sumner), 1860-1939. Boston, New York, Ginn
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Keywords: ., bookauthorplumbcha, bookcentury1900, bookdecade1920, bookyear1920
