The Red-faced Warbler (Cardellina rubrifrons) is primarily a Mexican species which breeds from central Arizona and southwestern New Mexico south through the mountains of northwestern Mexico. During the breeding season it inhabits montane forests; nests are constructed on the ground and are well concealed by vegetation. Although not shy, this species is relatively quiet and inconspicuous in spite of its striking coloration, and little is known about its ecology.
In 1973 and 1974 we studied the Red-faced Warbler to analyze quantitatively its foraging behavior during the nesting season. Such information should add to our understanding of the ecology of this little-studied species.