Ornithologist Edward C. Dickinson observed in a 2006 article that though evidence of morphological and vocal differences between S. przewalskii and S. leucopsis have been delineated, little had yet been published presenting comparative morphological details, and that it would be instructive to study how each taxon responds to the calls of the other.
O ornitólogo Edward C. Dickinson indicou nun artigo de 2006 que, aída que se delinearan as diferenzas morfolóxicas e vocais entre S. przewalskii e S. leucopsis, había poucos informes publicados que presentasen detalles morfolóxicos comparativos, e que sería interesante estudar como respondía cada taxón ás chamadas do outro.