Nice photo!!
I was visiting the Upper Peninsula in Michigan one spring and took a late night walk to lake Superior, and when getting close heard this amazingly loud and ethereal sounding noises, it totally sounded like what I would imagine a space ship taking off would sound like - a whiring, high pitched - not like an engine at all except in its steadiness. When I asked later what it was, I was told it was the frogs that had just hatched! I have never heard anything like it before or since and am still in awe!
