BOULDER, Colorado – North American barn swallows, which are widespread throughout Colorado, outperform their peers in reproduction by maintaining a positive balance of antioxidants, according to a new ...

A new study indicates North American barn swallows outperform their peers in reproduction -- the "currency" of evolutionary change -- by maintaining a positive balance of antioxidants commonly sold in ...

BOULDER – North American barn swallows, which are widespread throughout Colorado, outperform their peers in reproduction by maintaining a positive balance of antioxidants, according to a new study ...

Even after they have paired with a male, the female North American barn swallow still comparison-shops for sexual partners. And forget personality, the females judge males by their looks: the reddish ...

A new study led by the University of Colorado at Boulder has shown the testosterone of male North American barn swallows skyrocketed early in the breeding season when their breast colors were ...

If you are a male barn swallow in the United States or the Mediterranean with dark red breast feathers, you’re apt to wow potential mates. But if you have long outer tail feathers in the United States ...

Barn swallows are a cosmopolitan species, living in such far-flung places as Europe, the Middle East, Indochina and Australia, practically everywhere except some islands and the polar regions. I've ...

One warm and muggy morning on my walk, I notice swallows gathering on overhead power lines. The pair closest to me are northern rough-wings, and they are well into the throes of courtship: she, ...

It was — for far more than one reason — for the birds. Barn swallows — with their young tucked in a pair of nests built in the low-ceiling between two rows of stanchioned cows — were my ...

This is a preview. Log in through your library . Abstract Life history theory describes the optimization of important trade-offs within an individual's lifetime and predicts that an individual's ...

You can't miss the flying acrobats - aka barn swallows - as you drive under overpasses. They began arriving in late March from winter homes in Central and South America. The majority probably made a ...

ITHACA, N.Y. -- Even after they have paired with a male, the female North American barn swallow still comparison-shops for sexual partners. And forget personality; the females judge males by their ...