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Sept., 1909 CLIFF CLIMBING FOR PRAIRIE FALCON EGGS 165 hundred feet of sheer rock wall to the sharp-edged stones below, and thinks what would happen to him if he should make a slip. Such were our feelings when we stood peering over the side of a red sandstone cliff nearly one hundred feet in hight and slanting in near the base. This cliff is situated among the foothills about twenty miles to the southwest of Denver, at the canyon known as Deer Creek. One of the party, Mr. Harold Durand, had noticed that for two years before, a pair of Prairie Falcons (Falco meocicanus) nested there; so, on this day, May 2, 1909, we resolved to explore the face of the cliff. A little more than a third of the hight from the bottom was a cave-like opening about six feet high, four wide, and three back. Here the falcon had located her nest, soon to be disturbed by this party of egg seekers, with Mr. Durand as climber to represent them. NESTING SITE OF PRAIRIE FALCON NEAR LITTLETON, COLORAl)() As the rope went over the side of the cliff Mrs. Falcon could stand the excite- ment no longer and left the cliff protesting loudly. On looking over the edge the climber decided that he would rather climb up from the bottom than risk going over the top. Loops were tied in the rope about every ten feet so that he might rest. As he drew up opposite the opening, the cheering word came down to us, "five eggs." After a few pictures had been taken from below, the camera was sent up to the man in the cave for the photographing of the eggs. When this had been performed the camera returned and up went the egg box, each of the party below sending up some special directions, by wireless, as to the packing of the eggs. Now in order to correctly identify the eggs it was necessary to collect either or both of the birds. We had one shell left, and held our breath as Mrs. Falcon sailed over within range. The gun crackt. A piercing scream came from the bird,