A distinctive bird in the American Southwest is the Roadrunner (Geococcyx californicus). Not only is the roadrunner a bird with remarkable habits and abilities, it has a remarkable footprint consisting of a curved "X" shape. There is a petroglyph at the 3-Rivers site in New Mexico that shows a roadrunner along with his footprint. Perhaps this is like the name glyphs used to identify individuals in Ledger Book art. The distinctive footprint pointing out the identity of the bird.
"The roadrunner forages on the ground and, when hunting, usually runs after prey from under cover. It may leap to catch insects, and commonly batter(s) certain prey against the ground. Because of its quickness, the roadrunner is one of the few animals that preys upon rattlesnakes." (Wikipedia)