Beauty is in the eye of the beholder—even if that beholder is a barn swallow. Depending on where the birds live, some of them may favor mates with a paler chest color while others find a redder chest ...
Redirecting to: https://www.colorado.edu/today/2024/12/12/front-row-seat-evolution-what-common-barn-swallows-can-teach-us-about-how-new-species ...
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