Any man made noise is irritating, yeah the squirrels and chipmunks are noisy, but they don't bother me the way man made noises do. One of my favorite time passing games in the woods is to try and find the times that there is no man made noise to be heard. It's a rare thing for no planes, trains, trucks, saws etc... to be audible. Oh and I love the waves of little "tweety birds" that pass thru the woods.