So funny that you say that joe..I am always worried that the loud shrill of the frogs or the sound of the waterfall will bother the neighbors and cause a complaint..Agree!
You will soon have loads of tadpoles all over the pond.
The whistling sounds you hear are them doing their mating call. It can get quite loud. So loud, I fear my neighbors are being disturbed! I only hope they don't figure out it's my pond that is attracting them!
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