Turkey vultures in Superior, Arizona (25 images)

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Superior, Arizona (September 21, 2014) -- As September 20 brings the Autumn Equinox, marking the end of the summer, a flock of turkey vultures that make the Boyce Thompson Arboretum in Superior, Arizona their home from March to September each year, are about to begin their annual migration. Photographs by Eduardo Barraza © 2014