Some of you have heard the "drumming" of the male ruffed grouse, intended to attract a mate and mark territory. The drumming is "different" because it is NOT caused by the beating of wings against chest. Rather, the "drumbeats" or "thumps" are actually brief sonic booms. These occur because air quickly fills the vacuum formed by the wings thrusting outward from its chest. Different indeed.
Open edition lithograph from the art of Charley Harper
Paper Size: 16" x 13"
Image Size: 13" x 10"
(C) Estate of Charley Harper 2008