Lewis Petrinovich

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The pattern of responses of both male and female white-crowned sparrows to playback of recorded song depends on whether the female has eggs, nestlings, or fledglings, and on the behavior under consideration. These patterns can be understood in the context of the behavior patterns appropriate during each of the different stages of the reproductive cycle.
Twenty-five pair of breeding Whitecrowned Sparrows were presented with a live snake and models of a hawk, jay, and junco. Pairs were tested either when the female was brooding eggs, feeding nestlings, or fledglings. It was found that the snake was responded to the most when the pair had nestlings, very little when the female was brooding eggs, and at a(More)
Nestling white-crowned sparrows (Zonotrichia leucophrys nuttalli) were hand-reared in sound-isolation chambers under a variety of conditions. The songs of total isolates were compared with songs of birds tutored with song, and the number of inputs sufficient for a bird to produce a normal song was explored. The flexibility of the song learning system was(More)
The problems involved in reliably measuring bird territories and estimating their stability have often been ignored by ornithologists. Observers frequently use the same technique to measure territories as that used by Noble (1939) and other pioneers. Typically, the observer carries a map into the field and notes where a subject bird flies, sings, or has(More)