The locations of crowing cock pheasants (Phasianus colchicus) were mapped during sunrise crowing periods on a 1,100-acre study area, establishing population estimates of 51 cocks in 1956 and 79 in 1957. Some cocks began crowing in late February; most were crowing by mid-April and had ceased by the end of June. Sixty-three mapped territories ranged in size from 1.2 to 9.8 acres. A significantly lower mean territory size in 1957 was attributed to increased population density. Territory boundaries were well defined, probably as a result of population density, and shifts that occurred were clearly oriented in time and space. Open ground appeared to be a requisite for territories, and there was a preference for well-interspersed cover. The occurrence of nonterritorial males was associated with higher population densities. Nonterritorial cocks are distinguished from unmated cocks.