The smallest of the four peoples are the goblins who live in the trees. For their appearance, think of lemurs and raccoons. They're ambush hunters who imitate animal calls, lie in wait, then leap down in a burst of teeth and claws.
Their activity takes them all throughout the forest and occasionally into lands beyond, but the heart of goblin life is the tree. Up in a tree is safety, family, and home. It's where children are raised and it's where you rest at night.
Danger lies below.