Simians live in the rain forests where neither Orcs nor elves or even Sylvans venture. Until recently, their only contact has been with the Beastfolks with whom they have formed a firm friendship.
Their extreme adaptation to forest allows them to erect buildings without any cost.
During the rainy season, the Simians take shelter in the thickets and hunker down in the tree to keep the rain away. Invaders are almost never successful in taking Simian lands when the rain falls.