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The Cape May warbler feeds at the tips of branches near the top of the tree. The bay-breasted warbler feeds in the middle part of the tree. Competition Different species can share the same habitat, such as the many animals that live in and around the saguaro. Different species canalso share similar food requirements. For example, the redtailed hawk and the elf owl both live on the saguaro and eat similarfood. However, these two species do not occupy exactly the same niche. The hawk is active during the day, while the owlis active mostly at night. If two species occupy the same niche, one of the species will eventually die off. The reason for thisiscompetition, the struggle between organisms to survive in ahabitat with limited resources. An ecosystem cannot satisfy the needs of all the living things ina particular habitat. There is a limited amount of food, water, andshelter. Organisms that survive have adaptations that enable them to reduce competition. For example, the three species of warblersin Figure 12 live in the same spruce forest habitat. They alleat insects that live in the spruce trees. How do these birds avoid competing for the limited insect supply? Each warbler "specializes"in feeding in a certain part of a spruce tree. By findingtheir own places to feed, the three species can coexist . ..J~!J~.lMr!.1\!.C!. Many plants use chemicals to ward off their "".j) CHEMISTRY competition. Plants often compete with one another for growing space and water. Some shrubs release toxic, or poisonous, chemicals into the ground around them. These chemicals keep grass and weeds from growing around the shrubs, sometimes forming a ring of bare ground a meter or twowide. wf e~ The yellowrumped warbler feeds in the lower part of the tree and at the bases of the middle branches. Figure 12 Each of these warblers occupies a different niche in its spruce tree habitat. By feeding in different areas of the tree, the birds avoid competing with each other for food. Why can't two species occupy the same niche? Chapter 7 E. 33