Do birds get even?...

Do birds get even? This is what Ron and I were wondering yesterday when we went to Goleta Beach to enjoy an El Sitio burrito at sunset. All these pesky ugly birds were surrounding us and they were aggressive too! So we shooed them away with all kinds of hilarious sounds and sudden moves. Eventually they left. When we placed the empty tinfoil out away from our blanket they were back. So we threw it away. Well, perhaps they didn't like that we didn't share, because next minute one of them was flying along in a straight path. He went way out of his line of flight, hovered above us, pooped on us both, and then returned to his line of flight! Are birds more intelligent, and more vengeful than we thought....Perhaps there's more to birds than just fluffy tailfeathers!