Marshall, 1939 Othus flammeus Grand Canyon, July 19 overhead looked up with light ( ♂ still calling nearby) & saw m. owl fly to next tree. There I saw it, sitting high & in interior & on horiz branch. Eyes shine pinkish. Looked like FSU- probably ♀ - silent - male still calling. ♀ flew - then ♂ returned, hooting (in flight) to former perch. I walked farther into timber & called. ♂ followed & hooted from twig on side trunk of tall pine. I attempted to see how far the ♂ could be heard - walked 75 yds - then he stopped hooting. Went back & started him hooting again at same perch. ♀ walked 150 yds. back S to highway. Called there & ♂ stopped calling - after 1 min heard twig snap in high pine overhead & ♂ started hooting there again. Walked 150 yds. down Rd. ♂ still heard distinctly the very faintly at 150 ft.