A mature lowland tropical forest consists of several layers. The top layer of vegetation consists of scattered tall trees which tower above a closed canopy layer formed by the crowns of other trees. Below the canopy is a third layer, formed by smaller trees whose crowns do not meet. Below this is a layer is composed of woody and herbaceous shrubs. Finally, there is the ground layer, which receives very little sunlight.
Tropical rainforests have more kinds of trees than any other forests in the world.
The richest in plant species are Amazon forests, but in general all tropical forests have an incredible variety of trees. Conservation concern Rainforests are perhaps the most endangered habitat on earth. Each year, some 140,000 sq. Rainforests are being felled for timber by logging companies and cleared by people for farming. The most endangered rainforests are those in West Africa, where human populations are doubling every 20 years, and in Central America and South-East Asia.