english: Heads of subspecies G. c. contra (top), G. c. superciliaris (middle), and G. c. jalla (bottom); illustration by Joseph Smit, 1890
non_english: ndas subspesies G. c. contra (nduwur), G. c. superciliaris (tengah), lan G. c. jalla (ngisor); ilustrasi déning Joseph Smit, 1890