Prior to Price and Bock’s (1973) findings of polygyny in Colorado, the Dipper (Cinclus mexicanus) had been considered to be monogamous. This paper reports polygyny in a second geographical area.
We have been studying reproduction, movements and mortality of Dippers from 1976 to the present. These observations are being made on 8 km of the Ogden River from the mouth of Ogden Canyon to Pineview Reservoir and on 9 km of the South Fork of the Ogden River below Causey Reservoir, both in Weber County, Utah. Adult and nestling Dippers were banded with U.S. Fish and Wildlife Service bands and combinations of colored plastic leg bands to allow individual recognition.