Hybrid Large White-headed Gulls
- Herring Gull and Lesser Black-backed Gull interbreed to a limited degree where their ranges overlap, producing birds of intermediate appearance, which could be confused with Yellow-legged Gulls.
- Western Gull and Glaucous-winged Gull hybridise extensively in western North America. Evidence of genetic influence of each upon the other is found throughout the range of both species.
- Herring Gull and Glaucous Gull hybridise to a limited extent in Greenland and Iceland. The offspring have been termed "Nelson's Gull", but are sometimes also known as "Viking Gull".
Read more about this topic: Hybridisation In Gulls
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