Science Fact: Why Do Eagles Always Look Angry?

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This is a silly question, but eagles and other birds of prey seem to be in an ever grumpy mood. The way they stare, with those scowling faces and angry eyes, seems to be telling any observer to "back off." But their usual expression never really reflected their moods, it's just that their faces were built hat way, for a good reason. For one thing, the enlarged brows bone that gave them their expressions was there to protect their eyes and act as a shade when scanning for prey in the sunlight. Thh large eyes that enabled them to see their prey at a distance added to the stern expression. Lastly, there is the hooked beak and the angular face. Overall, birds of prey never held a grudge. They evolved to look that way.