Green frogs are plentiful this time of year. A good chorus sounds like a chaotic symphony of plucked loose banjos strings and rubber bands. It seems that when a smaller number of males are calling from a site, they give single note broadcast calls. When there is an abundance of space and a large number of males, they seem to give the multi-note calls, each note progressively diminished and lower in the scale. This call modification seems to be their way of increasing the chance of drawing in a mate so a series of notes can be followed vs one note lost in the surrounding sounds. There can be quite a bit of splashing about as the males defend their calling site from intruding males, both broadcasting and satellite. When a frog gets to close, an encounter call sounding like bubbles blown through a straw is given, often followed by a growling squeak, as one frog persuades the other to leave the area.