Green
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Black
the counting crows sung colour blind
the song is about how you can't see in color
There are some other colors of crows besides black, but don't look for anything bright and flashy. Use the links and sift through the 40 odd species to find out which ones have a bit of non-black coloring. Crows that are black are usually iridescent. That means if the light hits them correctly, one can see some cool color where it was black a moment before. Iridescence is an optical effect; the crows are black.
A congress of crows, or a murder of crows.