The eastern grey tree frog (sound) looks exactly like the closely related Cope’s grey tree frog (sound). The big difference between the two species is beneath the surface—the eastern has twice the ...

The frog season began late this spring. Like other vernal happenings, they were about one week behind the usual time. I did not hear any frogs calling until April 15, with the full chorus of the early ...

A Green frog (Rana clamitans) peers out from a pond in Arrowsic, Maine. There are nine species of frogs in the state and this common frog lives in Maine ponds, breeds in the summer, and hibernates ...

"Errrrrrrrrt, errrrrrrrt" reverberated loudly from a small red maple tree along Brodhead Creek, just south of East Stroudsburg. This sound seems quite similar to the song of the very common ...

Every other Friday, the Outside/In team here at NHPR answers listener questions about the natural world. Today's question comes from Andy, calling from Dover, New Hampshire. Alejandro Vélez: That is a ...

One of the joys of early spring is to hear the noise produced by the little frogs that call Indiana home. These often rather tiny, hard-to-find frogs can drive a person to distraction trying to find a ...

Two related frog species differ by chromosome number, which deepened one species's calls and tells the females who's who. Steve Mirsky reports The eastern grey tree frog (sound) looks exactly like the ...