POST-BREEDING AVIFAUNA AND MIXED INSECTIVOROUS FLOCKS IN A COLORADO SPRUCE-FIR FOREST

Abstract

Few data are available on post-breeding behavior and migration dates for birds of many geographic areas, especially for mountainous regions like western Colorado, whose avifaunas are poorly known in general (Bailey and Niedrach 1965, Davis 1969). This paper presents information on the late-summer birds of a high-altitude forest in western Colorado, with particular attention to the foraging and flocking behavior of small foliage- and bark-gleaners.