I noticed a Brown Pelican on a pier with something freshly caught. He was also in a staring contest with a nearby Gull. Pelicans may be larger, however the Gulls are master thieves.

From above another joined the scene, hovering over the Pelican.

Suddenly the meal was finished. There was no time for the Gulls to make a move. The Pelican had no time either.

I have seen Gulls standing right on a Pelican that has a catch. If you think about it, what can he do ? This Pelican was taking no chances, besides who wants a Gull standing on their head.