Tompson 105. Carlsbad Caverns Apr. 21, 1931 2:00 PM - 3:00 PM building a nest in a tree castry across the wash in front of the administration building. The nest was 6 1/2 ft. above the ground. It is wholly made of dry grass shaped like an olla, turned on its side. It is about 1 ft. long by 8" wide & high, quite symmetrically shaped. The two were looked very nearly alike in every respect. Both birds worked, bringing in gross & depositing it inside the nest. They made trips on an average of 5 min. Each time they left the nest, they flew to the top of the castry, perched, and looked around from a few seconds to several minutes. They never backed out of the nest. They remained in the nest each time they a few seconds to a minute. Both never entered in the at once, but alternated.