What do black-tailed prairie dog alarm calls encode about an approaching predator?

Black-tailed prairie dog alarm calls encode a predator’s type, size, shape, and speed.

Research by Con Slobodchikoff and colleagues found that prairie dogs produce unusually information-rich alarm calls. Their calls differ according to whether the threat is a coyote, hawk, human, or another predator, and acoustic details can also vary with the intruder’s physical characteristics. This is why the calls are often described as a form of animal communication that carries specific information rather than merely expressing fear.

The calls do not constitute human language, and scientists avoid claiming that prairie dogs possess grammar or unlimited descriptive speech. Instead, the evidence points to a structured alarm-call system with several meaningful acoustic dimensions. Black-tailed prairie dogs live in large colonies, so rapidly warning nearby members has clear survival value.

Their alarm calls are distinct from ordinary contact calls and from the barks used in other social situations. The famous findings also concern black-tailed prairie dogs specifically; conclusions should not automatically be applied to every prairie dog species.