I was a little nervous watching our 2-year old monkey boy climb up the rope ladder inside a tree, especially with typically oblivious older kids zipping around him, but he did great.
From the charlotteobserver.com
For one thing, being taken under the wing of a senior monkey may help younger animals forge friendships and climb the social ladder.
From the newscientist.com
Everybody wants to picture a smooth ladder of progress from simians to sapiens with a happy advance from bent monkey to knuckle-dragging ape to proto-human to homo-sapiens.