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    Several meteorological variables are known to influence the heat budgets of nesting birds (e.g., Walsberg and King 1978a, b). Such factors include air temperature, incident radiation, wind, and humidity. If the microclimate of the nest is unfavorable, parent birds may become inattentive, exposing eggs or nestlings to excessive heat or cold. They may then desert the nest and their offspring may die. To improve the probability of nesting successfully, many Old World desert birds place their nests so as to receive morning sunlight (Maclean 1976). Several investigators have demonstrated nonrandom orientation of hole entrances of New World cavity-nesting birds (Ricklefs and Hainsworth 1968, Inouye 1976, Inouye et al. 1981), but few have tested for the significance of nonrandom placement or variation in placement between seasons of open nests.

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    Finch, Deborah M. 1983. Seasonal variation in nest placement of Abert's Towhees. The Condor. 85(1): 111-113.


    Abert's Towhees, Pipilo aberti, seasonal variation, nesting

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