. Principles of economic zoo?logy. Zoology, Economic. 37G BRANCH CHORDATA ground to aid in walking they rest upon the back of the knuckles. Cheek pouches and tail are lacking and the hair is more scanty than in the baboons. These entirely Old World forms have a \'fTniiform a])pendix. The gibbons (Hyloh'ates), slender, nionkcy-like Indo-Malayun forms, stand at the base of the series. They are the smallest and most arboreal and their arms are the longest of any of the group, being Ions enough to reach the ground even when standing erect. The canines are large in both sexes and the jaws and nose
. Principles of economic zoo?logy. Zoology, Economic. 37G BRANCH CHORDATA ground to aid in walking they rest upon the back of the knuckles. Cheek pouches and tail are lacking and the hair is more scanty than in the baboons. These entirely Old World forms have a \'fTniiform a])pendix. The gibbons (Hyloh'ates), slender, nionkcy-like Indo-Malayun forms, stand at the base of the series. They are the smallest and most arboreal and their arms are the longest of any of the group, being Ions enough to reach the ground even when standing erect. The canines are large in both sexes and the jaws and nose are prolonged. The brain is simpler than in the higher forms. One of the most remarkable habits is their descending flight through the trees, tliough they ne\cT come to the ground. They leap incredible distances, says Hornaday, catch and swing with their hands, catch again \\ith their feet, turning again, and so on, by a series of re\'olutions almost as fast as tlie flight of a bird. The largest is the Sumatran Siamang, which stands .3 feet tall and is shining black. The gray gibbons are verj- timid, but show strong affection for their young and great courage in their Fig. 299.—Comparison of skeletons of primates: 1, Gibbon; 2, orang; 3, chimpanzee; 4, gorilla; 5, man. The brown orang-utan lives in Borneo and Sumatra, wholly in the tree-tops, coming to the ground only for water. On the ground it moves slowly and swings its boily along between its arms like a pair of crutches. In the trees, too heavy for leaping, they swingunderneath the branches with their long arms, "grasping a limb with their hook-like hands, and swinging underneath to the n i)res(Mico of two tho\isand visitoi-s. Each of the orangs learne<l its part in about two weeks' training, and at the ' 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 perfect
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