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Mar., 1911 NESTING OF THE FORSTER AND BLACK TERNS IN COLORADO 63 Our study of the terns was simply one of many illustrations of the wonderful changes of bird distribution brought about by the magic touch of water on what was once a dry, arid prairie. Fig. 29. CLOSER VIEW OF BLACK TERN'S NEST SHOWING DETAILS OF CONSTRUCTION ?UMMER BIRDS OF WILLOW CREEK VALLEY, MALHEUR COUNTY, OREGON By MORTON E. PECK URING the past summer (1910), the writer spent several weeks, that is, from June 22 to July 25, at Brdgan, Malheur County, Oregon. Brogan is as yet a town-site rather than a town, but it promises a considerable growth, as the result of the execution of an extensive irrigating project. It lies in the valley of Willow Creek, twenty-five miles northwest of the town of Vale, about fourteen miles from the Idaho line, one hundred and fifty from the southern boundary of the state, and a little less from the northern. The study of birds not being the primary object of the visit, only a small amount of territory was covered, though this was .looked over with considerable care. Some five miles of the valley of Willow Creek were gone over repeatedly, a trip of about eighteen miles was made up the canyon of the creek, two or three smaller tributary canyons were explored for several miles and visited on two or more occasions, and the sage-brush-covered hills were gone over for four' or five miles in various directions from Brogan. Willow Creek Valley proper begins about two miles above Brogan, where the