Doug Bell Catalog 1988 172401 283 Larus occidentalis occidentalis Location: Alcatraz Island (Parade Grounds); San Francisco Co., Calif. Date: 13 May 1988 Skeleton ➤ Sex: ? Fova > 0.50 cm . No enlarged midcut. Left Wing Weight: 915 gms Fat: Good Winglength: R 38.6 cm Span: 137 cm Pr. length 10 27.2 ➤ 26.6 9 27.8 6 25.0 8 27.0 5 24.6 Taillength: 15.0 cm Tarsus: 5.90 Toes: In: 4.31 Out: 5.41 md: 5.82 Headlength: 11.68 Bill length: 5.06 Post Nares: 3.26 Bill width: 1.18 Gape: 2.97 Bill depth gonyx: 1.98 ant post. nares: 1.96 nares: 1.81 Brood Patches: 3 un: 10 YR 7/10 B/11 Color Lm: 10 YR 7/12 Spot: 5 YR 6/10 Eyering Color: 10 YR 7/12 Irides: 5Y 8/4 No pigmt. Legs: 5 RP 6/6 Remarks: Trapped off 3 eggs Abdomen: LW+ RW+ Remains of small fish in stomach (saved). 2 yellow cheese-like spots on proventricular lining. Mate of 284. Eggs 283 A: 7.38x 4.61- 86 gms B: 7.12 x 4.76 = 87 gms C: 7.54 x 4.80 - 94 gms Eggs - MVZ 13610