If you simply look at it, the black is pure black and the white is pure white, I'm afraid it's really nothing. Even if it is almost the same, it is not too much. Here are just a few.

1. myna, this is the most common bird.

2. thrush is not very common, but it is not rare. It's just "people hiding in the mountains don't know."

In fact, there are several kinds, which are even less common. Make a plan if necessary.