In the summer dry season, at sundown, these insects start to whistle. I think maybe they are a kind of cicada, and the local people call them tutarones. I think they are the strangest, most interesting sounds! You can also hear some of the birds in the background. The view is only of the woods next to our house, but turn up your sound to hear what it sounds like. http://blog.thepanamaadventure.com/20... is the related blog post.