Pachycephala soror

Diamond, Jared & Bishop, K. David, 2021, Avifauna of the Adelbert Mountains, New Guinea: why is Fire-maned Bowerbird Sericulus bakeri the mountains’ only endemic bird species?, Bulletin of the British Ornithologists’ Club 141 (1), pp. 75-108 : 97

SCLATER’S WHISTLER Pachycephala soror

Modestly common above 1,570 m, from the understorey to the canopy. Sings mainly at dawn.ȱ Allȱ songsȱ areȱ aȱ simpleȱ patternȱ ofȱ aȱ half-dozenȱ whistledȱ notesȱ andȱ slurs,ȱ butȱ eachȱ renditionȱ differsȱ fromȱ theȱ previousȱ one.ȱ Despiteȱ theȱ absenceȱ inȱ theȱAdelbertsȱ ofȱ itsȱ usualȱ hill-forest congener Rusty Whistler P. hyperythra , the Adelbert population of P. soror does not expand its elevational range downslope.