Modern birds are the descendants of ancient dinosaurs and grey herons are the living proof of that I figure. In flight, with their long necks and wingspans, they look like pterodactyls. Have you ever heard their chilling raucous cry? They even SOUND like pterodactyls.
Want further proof? Take a look at that face and beak above. That is the face of a predator, my friend. Compare it to the image of a velociraptor head below and tell me you don't see a resemblance. I think we can all be thankful these things don't grow more than four or five feet tall.
-- Photo: agapemodels.com