Birds are plentiful on the Rockies, and the accumulating information concerning them may, in a few years, accredit Colorado with having more kinds of birds than any other State. The mountains and plains of Colorado carry a wide range of geographic conditions,--a variety of life-zones,--and in many places there is an abundance of bird-food of many kinds. These conditions naturally produce a large variety of birds throughout the State. Notwithstanding this array of feathered inhabitants, most tourists who visit the West complain of a scarcity of birds. But birds the Rockies have, and any bird-student could tell why more of them are not seen by tourists. The loud manners of most tourists who invade the Rockies simply put the birds to flight. When I hear the approach of tourists in the wilds, I feel instinctively that I should fly for safety myself. "Our little brothers of the air" the world over dislike the crowd, and will linger only for those who come with deliberation and quiet. This entire mountain-section, from foothills to mountain-summits, is enlivened in nesting-time with scores of species of birds. Low down on the foothills one will find Bullock's oriole, the red-headed woodpecker, the Arkansas kingbird, and one will often see, and more often hear, the clear, strong notes of the Western meadowlark ringing over the hills and meadows. The wise, and rather murderous, magpie goes chattering about. Here and there the quiet bluebird is seen. The kingfisher is in his appointed place. Long-crested jays, Clarke's crows, and pigmy nuthatches are plentiful, and the wild note of the chickadee is heard on every hand. Above the altitude of eight thousand feet you may hear, in June, the marvelous melody of Audubon's hermit thrush. Along the brooks and streams lives the water-ouzel. This is one of the most interesting and self-reliant of Rocky Mountain birds. It loves the swift, cool mountain-streams. It feeds in them, nests within reach of the splash of their spray, closely follows their bent and sinuous course in flight, and from an islanded boulder mingles its liquid song with the music of the moving waters. There is much in the life of the ouzel that is refreshing and inspiring. I wish it were better known. Around timber-line in summer one may hear the happy song of the white-throated sparrow. Here and above lives the leucosticte. Far above the vanguard of the brave pines, where the brilliant flowers fringe the soiled remnants of winter's drifted snow, where sometimes the bees hum and the painted butterflies sail on easy wings, the broad-tailed hummingbird may occasionally be seen, while still higher the eagles soar in the quiet bending blue. On the heights, sometimes nesting at an altitude of thirteen thousand feet, is found the ptarmigan, which, like the Eskimo, seems supremely contented in the land of crags and snows.