This document describes different types of habitats and ecosystems. It discusses forest, desert, and tundra habitats. Forest habitats cover large areas and provide shade and protection for many animals. Deserts cover over one-third of the world's land and are very hot and dry. The tundra habitat is located near the North Pole and about one-fifth of the earth's land is tundra. Tundra has permanently frozen ground that only supports low growing plants. An ecosystem includes a habitat, the living things within it, and their interactions.