The Spring Peepers (Hyla crucifer) are hard to see, but easily heard small frogs. They are in the amphibian word what American robins are to the bird world - a harbinger of spring.
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The large balls of light in the darkened sky are neighbors' outside lights; the small moving lights are vehicles out on the highway.
I recorded the sound just as nightfall descended. Oh what a treat it is to listen to these little creatures on a coolish spring evening!
A pond full of Peepers sounds like sleigh bells jingling. The chorus begins near nightfall and reaches a crescendo as darkness falls. The sound continues for a few hours until, all at once, the sound suddenly stops -- at about 9 p.m.
Peepers have large "vocal sacs" under their chins that are pumped full of air until they look like a full balloon. The mighty "peep" happens as they discharge the air.
Learn more about Spring Peppers here