sombre of the forests, which extend from the sea-shore inland, and thus
is found only in the eastern half of Sumatra, where alone such forests
occur, though, occasionally, it strays over to the western side.

On the other hand, it is generally distributed through Borneo, except in
the mountains, or where the population is dense. In favourable places,
the hunter may, by good fortune, see three or four in a day.

FIG. 9.-An adult male Orang-utan, after Muller and Schlegel.

Except in the pairing time, the old males usually live by themselves.
The old females, and the immature males, on the other hand, are often
met with in twos and threes; and the former occasionally have young
with them, though the pregnant females usually separate themselves, and
sometimes remain apart after they have given birth to their offspring.
The young Orangs seem to remain unusually long under their mother's
protection, probably in consequence of their slow growth. While
climbing, the mother always carries her young against her bosom, the
young holding on by his mother's hair.* At what time of life the
Orang-Utan becomes capable of propagation, and how long the females go
with young, is unknown, but it is probable that they are not adult
until they arrive at ten or fifteen years of age. A female which lived
for five years at Batavia, had not attained one-third the height of the
wild females. It is probable that, after reaching adult years, they go
on growing, though slowly, and that they live to forty or fifty years.
The Dyaks tell of old Orangs, which have not only lost all their teeth,
but which find it so troublesome to climb, that they maintain themselves
on windfalls and juicy herbage.

[footnote] *See Mr. Wallace's account of an infant