Backcountry Drummer

I heard a grouse drumming when I was sketching at Driftline Ranch a couple of weeks ago. In spring, lovelorn males beat their wings in the air to make a low thrum, like a putt-putt from a quiet stereo woofer. Every time I got up to try to spot this guy, he went silent. So I couldn't see if it was a Ruffed Grouse (brown) or a Spruce Grouse (black). I hope he impressed the ladies!