A lemur's nose is wet like a dog's nose to trap tiny scent particles from the air. That keen sense of smell tells the lemur if you're food, friend, or foe. It wasn't until 1983 that an expedition to Madagascar tracked them down. Incredibly rare, there may be as few as 1,000 left all in one forested area. In most primates, both sexes are the same color.
Langurs feed on mostly leaves and fruit, and spend much of the day resting while they digest.
A langur's belly bulges with intestines, necessary for digesting masses of leaves. In langur society, there's usually one grown male in a group of several females. The male guards his harem closely and does his best to chase challengers away. He even kicks his own sons out of the troop when they grow up. In the wild, these bachelor males often gang up in groups.