This shot shows a pelican right before he attempted to attack people at some kind of garden or animal enclosure. Clearly this bird is not happy with his surroundings. In fact, so often we hear that other birds like ducks or geese are totally mean and will chase you, it’s not often that you hear about larger birds like pelicans.
These people must have made the bird felt threatened in some way or maybe they weren’t offering him any food that he so desperately wanted. Either way, this place should definitely include a sign that says beware of birds!