Blackbird and black bird

也许一些画眉鸟是黑的，可以被称为BLACK BIRD. 但画眉是亚洲鸟（东亚）。

I think that the "blackbird" in Wallace Stevens' poem should be a common name. The bird must be common in American continent and must be black. I have a feeling that it is a midsized black bird. The cultural suggestion of them is apparent. This can be seen in stanza 11.