Birds of a feather.

"It's hard to say whether this hybridization is good or bad, but it's happening, and we will only understand the impacts through continued study", says study co-author Scott Taylor. These hybrids probably won't create a new species, however, as the females are likely to be sterile. NEW RESEARCH PUBLISHED in Global Change Biology has found that chickadee hybrids of two species - the black-capped and mountain chickadee - are more common in places where humans have altered the landscape. [Extracted from the article]

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