Crickets?
Speaking about crickets... (excuse the side conversation...), up in Oregon you hardly hear a cricket at all. I think there may be some around, but I’ll swear I don’t remember hearing crickets up there. But, in coming back down to Oklahoma, my gosh, there are crickets galore and they virtually “scream out” at you later in the day (of course, right now it’s a bit cold for them...)
Here’s a common cricket sound....
http://www.avisoft.com/sounds/feldgr.wav
But, when you combine about a thousand of them, all going at the same time and crescendos coming in wave after wave, it’s quite amazing... :-)