A bull snake will eat chicken eggs. In fact, I have found that
once a bull snake has discovered my hen house, it is virtually
impossible to keep it away without relocating the snake.
Yes, some snakes will eat chickens. Poisonous snakes and
constrictor type snakes are not choosy about what they eat; and as
long as they can kill it, they'll eat it.
More snakes, however, eat chicken eggs. Many snakes varieties
eat eggs as a regular part of their diet.