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THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 124. No. 1. March 2012 
rate of 3 to 8% per year, the range resulting from 
the actual values accepted for the other compo¬ 
nents. That prediction coincides with our discov¬ 
ery of new pairs each year at cliffs where none 
had been seen in earlier searches. 
ACKNOWLEDGMENTS 
This work was supported in part by funds from the U.S. 
Fish and Wildlife Service administered by the Montana 
Fish, Wildlife and Parks Department, the Wyoming 
Game and Fish Department, and the Colorado Division 
of Wildlife, and partly by funds arising within these 
agencies. K. C Uaynam and Adam Shteading helped with 
fieldwork in Montana. Observers in Wyoming included 
Terry McFaneaney, D. R. Mutch. S. M. Patla, D. W 
Smith, and L, A. VanFlcct. Michelle Cowardin, David 
Klute. K. M. Potter, and Michael Reid participated in 
Colorado. We arc grateful for their help. We thank Colleen 
Moulton for permission to use recent information from 
Idaho. Reviews by M. R. Fuller and C. M. White improved 
this paper. 
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