As much of the Amazon is unexplored, many of its indigenous plants and animals are unknown. Plant growth is dense and its variety of animals inhabitants is comparatively high due to the heavy rainfall and the dense and extensive evergreen and coniferous forests. The sunlight can not reach the ground because of the dense roof created by plants. The ground remains dark and damp and only shade tolerant trees and vegetation will grow here. Orchids and bromeliads exploit trees and other plants to get closer to the sunlight. They grow hanging onto the branches or tree trunks with aerial roots, not as parasites but as epiphytes. One tropical fruit tree that is native to the Amazon is the abiu. The Amazon Basin contains thousands of plant species. The bromeliads are special in that they hold water, and frogs may use these plants to hatch their eggs, besides many other living organisms that have their homes in them.The Kapok Tree is the biggest tree of the Amazon rainforest, as it can grow to 200 feet tall and the trunk can be 10 or 11 feet in diameter.