http://news.discovery.com/animals/endangered-species/frog-croons-in-drainpipe-to-amp-up-mating-calls-140604.htm#mkcpgn=emnws1 You know, in one of the books written by
Albert Payson Terhune that I read incessantly and doted on back when I was 7 - 12 years old, thr author described a bullfrog doing this same exact thing, with the same exact results. I mentioned this to Mrs. Harris, the ladt next door, and she called me a bald faced liar, said I was fantasizing, and threatened to tell my adoptive mother, who would have seized on any excuse to have me put away in an institution for the rest of my life.
Well, here's one in your eye, Mrs. Harris. Direct from real scientists, yet.