A number of species use a gaping, open beak in their fear and/or threat displays.

Black smoke oozed from the bird's open beak, rising only with difficulty.

The only concession to mortality was the open, gaping beak.

The birds are frequently shown with bright eyes and open beaks.

A raven sitting on the head, face turned from me, showed an open beak, threatening.

Water for the fountain comes from the bird's open beak.

Blood bubbled from his open beak, but he wasn't dead.

His was the one with the three birds with open beaks.

They came at us with open beaks and extended talons.

Then he handed it to her, gryph-grinning with open beak.