Marshall, 1938 Otus flammeolus Grand Canyon, July 19, 1939 I hooted, same result - seeing then sound of wings on twig, then a hooting above head. Walked 200 yds farther- a barely audible at 200 & hardly recognizable as an owl - sound distorted as it came thru trees. 2 more 150 yds jaunts with results, as before & I was back at the village, dawn breaking, & the a hooting in pine near village bus garage. I last 2 jaunts may have been a 2nd a - lower note T. tht heard Spotted Owl call once. Edge of transition - soon pine timber. Tapers off into pinon-juniper.