Marshall, 1939 Otus trichopsis Patagonia, Aug. July 16 equal intensity & duration. They were not broken off sharply from each other as are the notes of Otus fl. The seven syllables are given in about 3 sec. - a little more than 2 per sec. This call is very low for an Otus - fully an octave lower than the other 2 sp. which are around the C above middle C. It was very faint, also - for the bird was close at hand and retreated promptly whenever I tried to approach it. Nor could I lead it out. Its series of notes was given only every 2 or 3 min & the bird was hard to follow. I made several tries at it, also at the other two who squawked and squeaked occasionally from the screamoors in the floor of the valley. I thought that this was a two-man job - so I went to Woody, woke him up, & taught him the call. It was to start the owl calling, then I would get on the other side of it & he could drive it to me. (The owl called again near us & again I chased it far up the hillsides