Grey Partridge Perdix perdix ranges Iberia to China, with robusta in northern Xinjiang in Jungar Basin and adjacent Altai foothills. Distinguished from Daurian Partridge P. dauurica by greyer crown and back, slightly redder face and throat, and underparts lacking orange. Belly patch dark chestnut, not black as in Daurian Partridge, and there is no “beard” on throat, present on Daurian Partridge. Females very similar, but female Daurian Partridge sometimes show beard. Squeaky kieerr-ik call, sometimes heard at night. — Craig Brelsford
Daniel Bengtsson served as chief ornithological consultant for Craig Brelsford’s Photographic Field Guide to the Birds of China, from which this species description is drawn.