NESTING BEHAVIOR OF THE BLACK-CAPPED VIREO (VIREO ATRICAPILLA) FROM A NEWLY DISCOVERED BREEDING POPULATION IN SOUTHEASTERN COAHUILA, MEXICO

We studied four active nests of Vireo atricapilla in the Sierra de la Paila, southeastern Coahuila, Mexico, during July–August 2012. We quantified duration and behavior of each parent at nests during 25 h 10 min of video at two of the nests. Three nests reached the nestling stage, but only one was successful. We observed only the female constructing one nest. During incubation, females stayed in the nest 54.9% of the time, males 40.1%; both were absent 5% of the recorded time. Primarily the male conducted feeding of nestlings, whereas only the female brooded nestlings. We also recorded two new nesting substrates for the species.