Wrought Iron painted black, and crow naturally black. Look closer and you will observe that the black is something very special - amazing lustres of dark metallic blues combining to what we can only see as black from a distance.
There are also white crows. Some species of 'category: corvus' also are white and not all of them are completely black. Are not crows albinos, because they know that the eyes are blue pigment. If they were albinos would have red eyes or rosados.