MAMMALIA. 361 
spaces of forty or fifty feet, and, according to Darwin, they 
are the most musical mammals next to man, “singing a 
complete and correct octave of musical notes.” The orang- 
outang (Sima) (Fig. 379) is found in the islands of Bor- 
neo and Sumatra. They attain a length of a little over 
four feet, and a weight of one hundred and fifty pounds. 
The number of ribs is the same as in man, and there is 
some resemblance in the form of the brain, yet the capacity 
of the brain of the orang is only twenty-five cubic inches, 
while in man it is from seventy-five to ninety-two cubic 
inches. The arms are extremely long, the knuckles 
touching the ground in walking. The face is bare, the 
skin shiny black, and under the throat hangs in loose, 
flabby folds. The body is covered with reddish hair, 
twelve or fourteen inches long. In the male Stmia Wurmbit 
the face is widened to an extraordinary extent by a hard, 
gristly expansion of the cheeks, measuring across the face 
thirteen inches. The female is smaller, the hair a lighter 
brown. They are entirely arboreal, living always in the 
tree-tops, never jumping, but swinging their heavy bodies 
five or six feet at a time by collecting the branches. When 
at rest or wounded, they break off branches and twigs and 
form platforms or nests in the tree-tops. Their favorite 
food is the fruit of the durian-tree. The voice is loud 
and resonant, and can be heard for a long distance. 
The chimpanzee (A/imetes) (Fig. 379) is found upon 
the west coast of Africa, from the Gambia to the Benguela, 
and inland to 28° east longitude. They attain a height 
of nearly five feet, can stand or walk erect, but prefer to 
bend forward upon the knuckles (Fig. 380). The face is 
black and exceedingly human in its outline; they approach 
man, however, most closely in the character of the skull, 
their dentition, and the proportionate size of the arms; the 
brain capacity, however, is only twenty-six cubic inches. 
The canine teeth are powerful, though their food is en- 
tirely vegetable. They are arboreal, living in the trees, 
