Standing in a tropical forest at night, you might hear what sounds like a small bird calling from high in the canopy. Listen ...

If you’re in grasslands or fields in Wyoming and you keep getting whistled at, you’re hearing an upland sandpiper! These birds use their distinctive song to defend their breeding territory and attract ...

ANCHORAGE, Alaska — A caterpillar that emits a squeaky whistle may be mimicking bird calls that warn of an immediate, deadly threat. If so, the walnut sphinx caterpillar (Amorpha juglandis) is the ...