The sheer cliffs of Black Canyon, though not suited for human habitation, provide a great habitat for birds. Peregrine falcons, white-throated swifts, and other cliff-dwelling birds revel in the dizzying heights, while at river level you’ll find American dippers foraging for food in the rushing waters. Canyon wrens, which nest in the cliffs, are more often heard than seen, but their hauntingly beautiful songs are unforgettable. Dusky grouse are common in the sagebrush areas above the canyon, and red-tailed and Cooper’s hawks and turkey vultures frequent the canyon rims. Best times for birding: spring and early summer.