The orangutan is the only strictly arboreal ape and the largest
tree-living mammal in the world. Although other apes do climb
and build sleeping nests in the trees, they are primarily
terrestrial (spending their lives on the ground). Even the
bright reddish-brown hair colour is unique to the orangutan.
They have the most remarkable ability to travel through the
forest treetops. Each night building a new nest out of leaves
and branches in the very tops of the trees – sometimes as much
as 100 feet above the ground. Almost all of the food they eat
grow in the treetops and the frequent rains fill the leaves,
supplying them with drinking water. When water is difficult to
find, they chew leaves to make a sponge to soak up the droplets
in tree cavities. Although, when it rains hard, they might make
an umbrella for out of big leaves. Some might say orangutans
have four hands instead of two hands and two feet. These
appendages make them graceful and agile while climbing through
the trees, but makes walking on the grou