Abstract
Crow counts (number of calls) of cock pheasants (Phasianus colchicus) obtained during spring are used widely in the United States as indices for detecting relative changes in numbers of birds between years and different areas. The reliability and comparative value of these counts are affected by many factors. According to Nomsen (1953) and Klongland and Kozicky (1953), counts should be made at the same time of day in relation to sunrise in order to give comparable data. Kimball (1949) states that on rainy days crowing is less than on clear days. McClure (1944), while inducing crowing by detonations, noticed that optimal temperature range for crowing appeared to be between freezing and 500 F.
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