Friedrich Esser 的对比图镇楼,图片来自:
Comparison of species - pavo-muticus.com
http://www.pavo-muticus.com/english/among-breeders/artenvergleich.html
Comparison of species - pavo-muticus.com
http://www.pavo-muticus.com/english/among-breeders/artenvergleich.html