One of my favorite photography subjects is the Ruffed Grouse. Starting in the spring, the males will sit on a log and perform a "drumming" courtship display by flapping their wings to attract the females. The sound this creates is a muffled, thumping beat that gets progressively faster, sounding something like a small engine trying and failing to start. It is quite a beautiful spectacle and a welcome sign of spring after a long winter.