David King, University of Massachusetts at Amherst (IMAGE)

University of Massachusetts Amherst

David King, University of Massachusetts at Amherst

Caption

King and colleagues analyzed data collected by thousands of volunteers for the North American Breeding Bird Survey to determine shifts in northern latitude and upper elevation boundaries of 40 songbird species between two time periods, 1977 to 1981 and 2006 to 2011.

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David King

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