Black-capped chickadees, dark-eyed juncos and cardinals congregate around a backyard feeder as birdseed falls to the grass like sprinkles. Suddenly, from the sky comes a flash of vivid green and blue, ...
Monk parakeets risk losing their hard-won social standing if they are absent from their flock for just eight days. And the highest-ranking birds lose the most status during their brief absence.
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