I agree, they are blue.I know that grey is blue, but in comparing her to the two gray birds, I think she is really a black. The splash is very light, mostly white with a few black feathers. The other two are blue, one darker and one with a bit of black splashed in. Whatever colors they really all are though, they are turning out to be very pretty birds. In the pics below, the top one is the "black" with the lighter blue bird. All four amercaunas are in the middle picture with the splash in between the two blues and the darkest one off to the side.
Here is my dark bird, Sarah, who I think is a black.