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Our crows are all black, they always remind me of the birds the 'wicked evil Disney Queens' have as pets. Which I am sure they are not!
Our black crows are highly intelligent birds that problem solve how to open paper bags of sandwiches and children's lunch boxes.

You mean the are completely black ? Those are what we call ravens here.. ther are a wee bit bigger than these nomal grows.
These are mostly black, maybe its just the black feather catching the light that makes them seem like blue.
Crows are in general very smart creatures and very sociable too.