Bats are flying mammals you might spot and — rarely — hear at nighttime. Here are three common bat sounds — and what they mean.

Charles Darwin is most famous for his finches, from whose beaks he gleaned the idea that a single species might radiate into many. But he studied other attributes of birds, too—like the rhythmic ...

Phenotypic characters with a complex physical basis may have a correspondingly complex evolutionary history. Males in the “bee” hummingbird clade court females with sound from tail-feathers, which ...

The critical threshold or frequency at which an interrupted or “fluttering” sound appears to be continuous, an aspect of human perception analogous to the visual critical fusion threshold, has not ...