Swallows live with humans to avoid cuckoos, but lose knack for identifying imposter eggs.
via LiveScience.com http://www.livescience.com/28543-swallows-fight-cuckoos-live-with-humans.html
via LiveScience.com http://www.livescience.com/28543-swallows-fight-cuckoos-live-with-humans.html
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