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Four subspecies are recognized. They differ in bill proportion and form a rough NE-SW clinal in size across North America. Birds are smallest in the far west and on the south coast. Corvus brachyrhynchos brachyrhynchos – Eastern Crow: northeastern United States, eastern Canada and surroundings. Largest subspecies. Corvus brachyrhynchos hesperis – Western Crow: Western North America except arctic north, Pacific Northwest and extreme south. Smaller overall with a proportionally more slender bill and low-pitched voice. Corvus brachyrhynchos pascuus – Florida Crow: Florida. Mid-sized, short-winged but decidedly long bill and legs. Corvus brachyrhynchos paulus – Southern Crow: southern United States. Smaller overall, bill also small.
I took this photo at ACADIA NATIONAL PARK, bar harbor, Maine.