FIELD NOTES DOUG BELL DATE: MAY 18, 1985 LOCATION: Alcatraz Island, San Francisco Bay, California. WEATHER: Clear, sunny. TIME: 9:00 - 14:00 Checking nests, measuring & weighing eggs of Western gulls (Larus occidentalis). Checking all areas of the island. With C. Annette, Maren and Annette Burger. Finding many new nests with 1-3 eggs in the rubble area, walkway north of the power house, and on the perimeter. These could be new gulls settling the island, or birds that were displaced from the parade grounds on the south end of the island. We spotted a Heerman's Gull while checking nests on the Industry Building. It seems to always show up when we are in this area. The gull nest on the I.B. that was being blown away during my last visit (5/12) is no longer in existence. While walking the perimeter we found a nest with 1/2-normal sized gull eggs in it. Thought it to be Heerman's nest. However, a pair of Western gulls kept hanging around it. I at first kept scaring them off - afraid they wanted to eat the eggs. It turns out - they were incubating the 1/2-sized eggs.