Marshall, 1945 Palan Otus podarginus The "tapering-off" is given in flight as the male flies to a new perch near the female. The female joins in at the climax of the male - giving him the desired locating, and the entire "tapering off" or part of the climax therefore consists of a duet. Assuming as Call of male: Staccato whistled cry sounds just like Glaucidium brasilianum - i.e. not mellow pure tone like "quoma" but a sharp "quirt", longer interval than former and often irreg. intervals - 1 note per 1 1/2-2 sec in rise to climax, more rapid at climax 1+ sec and tapering-off. Rise to climax: quality as above, all same pitch, but may start low & mellow & rise to full harsh tone in a few sec - then the extended series. Toward climax, interval changes to 2 together, pause, series, 2 together, pause etc. Climax: sharpest, loudest & highest - double notes, 1st a minor third above 2nd, each phase given in 1 sec interval at peak of climax - just before flight. "Tapering off": single notes in ordinary spacing but series descending in pitch & becoming softer, low, and mellow; last few return to the double (of) the climax) but at the new soft low level. Call of female Same thing, but 1st 2 parts compressed