Why does lion-tailed macaque live on trees for most of its life?

The lion-tailed macaque (Macaca silenus) is a primate that spends most of its time up within trees because of its shy and solitary nature. They have rather meek and reclusive dispositions, and because of that do not generally travel very far out of their forest home ranges.

Read more on the characteristics and habitat of Lion-tailed Macaque on the given link.

Further readings-

1. The Wildlife Protection Act
2. CITES – Convention on International Trade in Endangered Species