A few years ago I used to work for the National Park Service in San Francisco. I was teaching a lesson with a visiting boy scout troop on the coast when a seagull jumped on the back of a pigeon scavenging on the beach, the seagull then proceeded to rip into the living pigeon by pecking into its back. Many scouts started crying asking if there was something we could do to save the pigeon, all I could do was shrug and say "It's the circle of life." Inwardly I was pretty shocked at how savage seagulls can be. They don't fuck around.