A sequence of acoustic events is perceived either as one continuous sound or as a stream of temporally discrete sounds (acoustic flutter), depending on the rate at which the acoustic events repeat.

Though famous for their mid-air hovering during hunting, tiny hummingbirds have another trait that is literally telltale: males of some hummingbird species generate loud sounds with their tail ...

Fork-tailed flycatchers make a fluttering sound with their wings—but separate subspecies have different “dialects” of fluttering. Christopher Intagliata reports. Charles Darwin is most famous for his ...