Abstract
Nesting bird composition and population densities reflect the suitability of a given plant community for providing the requisites for survival and reproduction, and also, the selection of these suitable habitats by the birds. Two important features in habitat selection are availability of food and nest-sites (Hilden 1965). Open-nesting species depend on foliage for concealment and protection of the nest from harsh weather and predators (Nice 1957). More than ample foliage for nest-sites is usually available to these species, whereas a major problem confronting hole-nesting species is locating suitable sites (von Haartman 1957). Tree-foliage nesting birds of the oak woodlands in southeastern Arizona may be limited in the same manner as hole-nesters because
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