Type: journal article

Article abstract: In our earlier papers on a life history study of the Cactus Wren (Cam&~Z~rh~~ltus brzmneicapillus) in the vicinity of Tucson, Arizona (1957,1959, and 1960) we discussed the environment, winter activities, roosting nests, song, territorial establishment, pair formation, and the nesting cycle up to the time at which the young leave the nest. The present paper describes the nestling growth and development from the time of hatching to the time of fledging.