FIELD NOTES LOCATION: Alcatraz Island, San Francisco Co., Calif. Doug BELL March 23, 1986 side by side, stock choking, long calling. Turn and face each other, then couple lunges. One grabs other's bill and holds it firmly. Both birds begin trying to pull one or another back into its territory. Simple stand off, with neither succeeding, but one has a better grip on the other. Birds held together over 2 min., then the one with the better grip began pulling other into territory. Birds lost grip, re-lunged. Again, the one was gripped around bill, this time near eye. The "looser" began hitting second bird with left wing very violent. About a minute of this went on, then they broke off. Mates during whole time watching, long calling, picking gravel. When winners broke off its mate came up to it, calling. Looser stood ground on territory. Birds still long calling. 2:30 pm - Face-offs still going on. Both males will sit or ground, pick, but sit almost hunched: at ground