Scientists in Australia recorded the first ever audio of echidna vocalizations, a sound which may be linked to reproduction, a study said. Photo from Michael Jerrard via Unsplash As three spiky ...

It’s an annoying sound, described as a screech, a hiss or a nasally shriek. And it’s being heard much more often these days from the backyards of Denver to the pasture lands around Cortez. It is the ...

Last year we heard the first hollow, mournful cooing sound of the mourning dove on Feb. 25. Such wintering-over birds are usually first heard by the third week of February, as an early sign of spring.

The answer is more complicated than you might think.