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Is the Mountain Bluebird Resident at High Altitudes?

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During the latter part of February and early March of this year (1907), Sialia arctica was very numerous in and about Flagstaff, Arizona, altitude 6800 feet; in fact, the commonest bird. That period also covers the coldest weather for that locality. And as this bird is a known breeder in northern Arizona (San Francisco Mountains), can we not infer that they are resident in that zone?

Benson, Arizona

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