Elephants affect their environment perhaps more than any other creature on earth. Their size, strength, and food needs make this inevitable. They can completely change a landscape just by feeding. They strip bark and leaves from trees and bushes, pull trees straight out of the ground, trample underbrush, dig for roots, dig holes in dry riverbeds to reach water, and spread plant seeds over many miles with dung deposits. There can be no mistaking when an elephant herd has passed through an area. Because of their tremendous environmental impact, elephants also greatly influence the survival and adaptive strategies of many other plant and animal species sharing the same ecosystem.