What is the scar oat head like

The head and neck of the yellow bird canach are gray -brown.Look at the yellow bird, first look at the shape, usually from the tip of the mouth to the tip of the tail at least 12 cm.Secondly, it depends on the shape, mainly check whether it is symmetrical.Then look at the tail, it is best not to split.It also depends on the feathers on the head. The feathers must be clean, preferably numb.Finally, it depends on the feather color, and the color is pure.