The top layer of the Amazon rainforest is the emergent (or dominants) where the tallest trees are found; then the primary layer is the canopy (upper layer or habitat zone), where about 70 to 90 percent of all rainforest life resides.
The top layer is the emergent (or dominants) where the tallest trees are found (up to 200 feet tall). The Amazon rainforest has four layers, each of which has its own unique ecosystem. The primary layer is the canopy where about 70 to 90 percent of all rainforest life resides. In forest ecology, canopy also refers to the upper layer or habitat zone, formed by mature tree crowns and including other biological organisms (epiphytes, lianas, arboreal animals, etc.). 
