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If you think about the tree and shrub coverage on the Boise Ridge as a major avenue for wildlife, you can begin to understand the important role it plays for migratory birds. Many raptors and song birds, called "neotropical birds", travel this ridge as they migrate between summer and winter homes. Some birds travel as far away as South America and Alaska, and use this zone for its cover and the thermals that are created along it. They make their way along the ridge, feeding and resting for the next big leap across the Snake River Plain.