Banyan

Once the roots get to the ground, they suck up nutrients and grow faster and thicker. They cover the trunk of the host tree, and their leaves and branches in the canopy block the light from the host. Lacking enough nutrition and light, the host tree eventually dies. Its wood is destroyed by beetles, termites and fungi. Only the hollow space inside the banyan remains. The banyan roots make a huge cylinder, and it stands up perfectly well.