42K views · 261 reactions | Male ruffed grouse are known for their territorial display called drumming, but the grouse’s wings do not actually strike anything. Each thump you hear is air filling the vacuum created by the bird’s wings, similar to how lightning produces thunder. This grouse was recorded in Zaleski State Forest. | Your Wild Ohio - Hunter | Facebook

52K views · 526 reactions | The ruffed grouse is hard to see, but its drumming is a fixture of many spring forests. If you look closely, however, you'll see the male’s signature display doesn’t involve "drumming" on anything but air! © David & Laura Hughes | West Virginia Nature Conservancy | Facebook