Wild Life on the Rockies by Enos A. Mills

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.