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Birds are warm blooded egg-laying vertebrates with feathers and wings. Their native habitats vary from dry land, fresh or ocean waters to marshes, forests, or desert. Some birds are migratory, some stay localized, and some cannot fly, like the ostrich. Some are predatory; some are scavengers. Their ecosystems determine their colorations, their food preferences, their migration patterns, and their body adaptations - short, long, pointed, or flat beaks; long or short, weak or strong legs, and webbed or toed feet.