Birds across the Americas are getting smaller and longer-winged as the world warms, and the smallest-bodied species are changing the fastest. Birds across the Americas are getting smaller and ...
image: An analysis of a bird species' unique rasps shows how sound fluctuations in birds' songs might reveal details about birds' body sizes. view more An analysis of a bird species' unique rasps ...
Dec. 4 (UPI) --Migratory songbirds in Illinois are no exception to Bergmann's rule, which posits specimens representing that same species tend to be smaller in warmer climates and bigger in colder ...
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