the bird behind the cherry crow

For "The Cherry Crow Children of Haverny Wood", I knew the title before I knew the story — which meant I knew the name cherry crow before I knew what the crow itself would actually look like.

They were one of the first things I pondered, then, in trying to uncover the story. Why were they named cherry crows — was it to do with their appearance, or their diet, or something else entirely? Why did the villagers of Haverny Wood fear them, and were they right to?