Abstract
A sample (n = 647) of feral rock pigeons collected in Syracuse, New York, between July, 1964 and Feb., 1965 revealed the presence of polymorphism of plumage color and wing pattern in the population. Five mutant phenotypes each comprised more than 2.5% of the sample and apparently are being maintained by unknown selective advantages. Proportions of 2 common phenotypes changed significantly during the winter months. Estimates of mutant gene frequencies at 5 loci ranged from .037 to .239.