392. Yellowstone National Park Aug. 9. This evening about 6:00 PM we saw a Great Gray Owl in the meadows about 1/2 mile east of Square Lake. The owl was in plain view, standing among the grass of the meadow. We watched it for about 4 minutes, during which time it perched on various stiles and posts, swooped once to the ground as though after a grouse, or mouse in the grass, apparently got nothing, and finally flew to a clump of trees too far away to see. About 10:00 o'clock this evening we heard Great Horned Owls hooting out on the parade ground at Mammoth. Aug. 14, 1933 This afternoon, from 4:00 to 7:00 we were at Swan Lake. A pair of Trumpeter Swans has nested on the lake this year, for the first time in many years, and has been seen with 3 cygnets. We think it may be a young pair nesting for the first time, perhaps the pair seen there last summer in July & then seen mating at