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European herring gull - Wikipedia
Herring Gull Identification - All About Birds
Herring Gull Overview, All About Birds, Cornell Lab of Ornithology
Herring Gull | Audubon Field Guide
Herring Gull - eBird
Herring Gull Life History - All About Birds
Herring Gull | BTO - British Trust for Ornithology
European Herring Gull (Larus argentatus) - BirdLife species …
European Herring Gull | Larus argentatus | Species Guide | Birda
European Herring Gull (Larus argentatus) - BirdLife species …