Then, in the 1980s, two unique kinds of bird were found with plumage that was a mixture of colors, such as having a white cap but with orange-yellow spots and black whiskers.
八○年代更在重疊區發現頭部羽色兼具兩者特性的「雜」頭翁，譬如白色頭冠卻有橘黃點和黑色唇鬚。