Catalog 172342 Larus occidentalis occidentalis 323 Location Red Rock Island, San Francisco Bay, Calif. S.F., Contra Costa & Marin Counties Date 10 June 1988 Skull LW Sex ♀ 4ova >0.40; 10 ova >0.30. Weight 985 gms Fat Heavy. Winglength 40.9 R Span 138 cm Pr length 10 28.4 7 26.1 9 28.9 6 24.3 w 8 27.8 5 22.8 √ Taillength: 14.9 8 of 12 rects. w/darker shafts. Tarsus: 6.06 Toes In: 4.15 Mid: 5.78 Out: 5.65 Headlength: 12.21 Hal: 0.61 Bill length: 5.69 Post Narix - 3.46 Bill width: 1.27 Gape: 3.89 Bill depth Gaps: 2.01 ant Narix: 1.87 Post Narix: 1.70 Brood Patcher: 3 Bill Color um 2.5 Y 7/12 sm 2.5 Y 7/12 Spot Color 15 Eye ring color 10 YR 7/10 Tibio 5 Y 7/3 Pipit 10YR 3/3 small flecks only Legs 5 R P 5/4 Remarks: Trapped off 3 egg nest. Threw up 6" fish - lt. blueish on side. Nest on pebble beach. Eggs: 323-A: 83 gms) 7.17 x 4.89 cm 323 B- 84 gms 6.98 x 4.88 C 82 gms; 7.05 x 4.78 cm: 2 small fish remains in stomach - saved. P° 10-3 Measured after freezing