The bulk of the lowland areas of the Indomalayan ecozone consists of tropical forest. The climate, known as a monsoon climate, supports forest habitats. During the summer the constant heat over the northern part of the Asian continent gives rise to low pressure areas that bring moist winds in from the Indian Ocean. A rainy season ensues. During the winter the continent cools and dry air blows out towards the ocean. The mainland forests thrive in this seasonal rainfall, but the forests of the Malesian islands receive the wet winds all year round (both northerly and southerly winds blowing over sea areas before reaching them) and are particularly luxurious. Tree life is abundant, and many species of treewyrm exist in the tropical forest.The treewyrm is directly descended from the desert burrowing wyrms of the Afrotropical ecozone. Although the sinuous shape developed in response to a burrowing lifestyle, it became suitable for many other ways of life. The extra ribs along the neck can be moved in waves, like the legs of a centipede, and allow the animal to crawl up very steep slopes. The bulbous body is pushed along behind by the hind legs. The treewyrm feeds on small insects and fellow vertebrates.
The distribution of treewyrms is widespread, especially in the tropical forests of the Indomalayan ecozone, the animals having moved there across the Thar Desert.