Talk:Hetare/@comment-10733658-20160627115239/@comment-10733658-20160627154006

With Cockatiels in particular, plumage is typically different enough. Hens typically have a muted color on their heads, and a pattern on their tail feathers. Cocks typically have a vibrant yellow head, with very distinct red markings on the cheeks and no tail markings.

Obviously, some variant can occur in real life. But that's unlikely to be what Ishida is going for, instead of "typical adult male Cockatiel".