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 ...

In a new study, scientists describe how different traits used to choose mates in barn swallow populations are driving the bird to diverge, which could eventually lead to the formation of new species.

In her Distinguished Research Lecture March 12, CU Boulder Professor Rebecca Safran will explore the recent and precipitous decrease in the population of barn swallows Some 10,000 years ago, the ...