There is great variation in structural and behavioral adaptations among birds. Structures of organisms show their adaptations to environments and ways of life. Variations found in species help them survive changes in environmental conditions. Rapid or catastrophic changes in an ecosystem affect the ability of organisms to exist within that environment. People may effect changes in ecosystems and watersheds to ensure the survival of organ-isms within it.
Biological diversity is important to people in many ways.
Animals play an important role in ecosystems and are necessary for the ecosystem to function properly. Humans rely on ecosystem diversity for many reasons. Accordingly, they must exercise judgement, care, and planning in their use and management of wildlife resources.