When we were in the process of buying our farm I had the opportunity to meet the former owners and get a little tour. I recall that they mentioned that the frogs in the pond next to the house could be very loud. They told me that we would have to keep the windows closed if we wanted to get any sleep. I remember thinking to myself, "Yeah right, you obviously aren't nature lovers like we are!"
Now that we are living here I may have to recant. The weather hasn't gotten quite warm enough yet to tempt us to leave the windows open at night, but I have to admit that the peepers are extremely loud! It is so noisy out there that you can tell when anybody opens a door from anywhere in the house.
I made a little video here to demonstrate. Take note of the sound level in the house before I open the door.