100. Bildstein, K.L., and J.I. Zalles. 2005. Old World versus New World long-distance migration in accipiters, buteos, and falcons: the interplay of migration ability and global biogeography. Pages 154-167, in Birds of Two Worlds: The Ecology and Evolution of Migratory Birds (R. Greenberg and P. Marra, eds.). John Hopkins Press, Baltimore Maryland. | Hawk Mountain Sanctuary: Learn Visit Join

100. Bildstein, K.L., and J.I. Zalles. 2005. Old World versus New World long-distance migration in accipiters, buteos, and falcons: the interplay of migration ability and global biogeography. Pages 154-167, in Birds of Two Worlds: The Ecology and Evolution of Migratory Birds (R. Greenberg and P. Marra, eds.). John Hopkins Press, Baltimore Maryland.

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