Abstract
During the autumn and winter, flocks of Scrub Jays (Aphelocornma coerulescens), Mexican Jays (A. ultramarina), and Steller Jays (Cyanocitta stelleri) frequent the oak-grassland (open encinal) foothills of the isolated mountains of southeastern Arizona, a habitat in which normally none of them breeds. During the breeding season they are ecologically isolated, although some interaction may occur between Scrub and Mexican Jays, or between Mexican and Steller Jays (Pitelka 1951; Marshall 1957). Little information is available on interspecific assemblages of the New World jays, and this study of sympatric flocks of these habitually gregarious species provides data on the mechanism of flocking. To observe the interactions among these jays, I visited selected sites in the oak-grassland association between 4000 and 5000 ft of
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