Abstract
Several displays and mannerisms of free living Yellow-billed Magpies are described and compared with those of other corvids. The data were collected over a period of 4 years at the Hastings Natural History Reservation, Monterey County, California. Following a brief description of the annual cycle the paper describes and compares: aggressive behavior (Upright, fighting, Head-forward, displacement behavior, and behavior toward feathers), pair maintenance behavior (Allopreening, Billing, and Tugging), courtship behavior (Courtship feeding, Copulation), self-maintenance behavior (Sunbathing), appeasement behavior, and play behavior. The occurrence of these displays among corvids is summarized in Table 1. It is concluded that behaviorallyPica is not as close toCorvus as isGarrulus. It is suggested that in the phylogeny of the Corvidae the magpies diverged from the main line at an early time. The main line then split leading toCorvus andGarrulus.
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