Although this estimate is probably high, the sandy floor of the cavern makes it ideal for tossing a frisbee around. The Canyon Wren. T he call of the canyon wren is a unique part of the river experience. Once you've heard its plaintive call echo through the canyon, you never forget it. Since the view from the ruins is popular with river runners and hikers alike, multiple trailing has occurred.
Efforts are underway to minimize human impact and revegetate the area.
T he confluence of the Colorado and Little Colorado Rivers marks the end of Marble Canyon and the beginning of the Grand Canyon.