Think of the nighttime grasshopper trill, the squeak of a mouse, the hooting of an owl, the bugle of a mountain-top elk. Anthrophony, or noise from human activities, usually has lower frequency sounds ...

All over the world, different types of frogs call out in various ways to warn others or attract mates Olivia Ferrari Different species of frogs call out in various ways, and they may sound like ...

The sun has just set over a swamp east of Santa Cruz, Calif., and Gary Kittleson is putting on a headlamp and waders. The environmental consultant is searching for red-legged frogs. Some years, he ...