I studied a population of 15 breeding pairs of Burrowing Owls and their offspring from 5 May 1970 to 20 May 1971 near Albuquerque, New Mexico. Observation time totaled over 400 hr. Most observations were made from a car or on foot and 7 x 50 binoculars and a 20 X spotting scope were used. A portable blind was employed for close observations and for recording vocalizations. Lights disturbed the owls and thus were not used. Vocalizations were recorded with a Uher 4000 Report-L Tape Recorder and Uher M-514 microphone at 7? ips. A 24-inch parabolic reflector sometimes was used. A more complete analysis and discussion of vocalizations of Burrowing Owls can be found in Martin (1973). Of breeding pairs, nine females and nine males were color-banded for individual recognition. At least one adult of each pair was banded at all but two burrows. One unmated adult and 48 young also were banded. Each owl received a U.S. Fish and Wildlife band and a two-color combination of red, white, green, or yellow color bands. Owls were captured by placing Havahart traps within the burrow mouth as described by Martin (1971a). All adult owls were sexed by presence or absence of a brood patch and by feather coloration. This later was confirmed by their behavior in the field. All owls were weighed, inspected for ectoparasites, examined for molt, and had their remiges and retrices measured before release. Two young owls were captured during their first observed emergence from their nest burrow and maintained in captivity for behavioral studies.