Many of the trees have their branches intertwined and they are also tied together by many kinds of creepers. Lianes are climby woody plants that are rooted in the ground and use other plants as support so that they can reach the light. The Understory Layer occurs at around 25 metres and is home to thousands of plants, insects and birds. If a tall tree falls down, small ferns and trees will grow out of it. The Understory is a relatively small place and is very dark and wet, so the trees there don't grow very tall.
Epiphytes are plants which perch on or adhere to other plants.
They collect water in a variety of ways from rain and get nutrients from organic matter. Mosses, lichens, orchids, ferns, elkhorns, staghorns, and bird nest ferns are Epiphytes that grow in the Understory. It is dark here because all the other layers have blocked out the sunlight. It is also the most humid part of the Rainforest. There is no grass here.