| Ring-billed Gull | ||
| (Larus delawarensis) | ||
| RBGU-1 Winter adult |
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| Baylands Nature Preserve, Palo Alto, California October 1996 © Peter LaTourrette |
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| RBGU-3 Winter adult |
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| Baylands Nature Preserve, Palo Alto, California February 1999 © Peter LaTourrette |
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| RBGU-5 Near-Breeding |
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| Shoreline Lake, Mountain View, California March 2000 © Peter LaTourrette |
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| RBGU-6 Winter adult |
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| Water Treatment Center, Sunnyvale, California September 2001 © Peter LaTourrette |
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| RBGU-7 Winter adult |
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| Baylands Nature Preserve, Palo Alto, California December 2005 © Peter LaTourrette |
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