If you walk by a pond on a summer evening, you may hear the deep “jug-o-rum” of a bullfrog or the “tung” of a green frog, sounding like a plucked banjo string. Sometimes you’ll hear a whole chorus of frogs, the songs competing with each other for attention.
The frogs are not singing for our enjoyment, of course. Most frog sounds we hear are advertisement calls to attract mates, and the callers are usually males. In some species, these vocalizations also help male frogs maintain territories against other males. If you look closely around the shore of a pond, you often see male green frogs spaced at regular intervals. » Continue Reading.