Wait – that's NOT a Seagull? - MSU Extension
PPT - Biology 3.5 PowerPoint Presentation, free download - ID:3026695
Introgressive hybridization and the evolutionary history of the herring gull complex revealed by mitochondrial and nuclear DNA | BMC Ecology and Evolution | Full Text
Ring species - Wikipedia
Darren Naish: Tetrapod Zoology: No no no no NO: the Herring gull is NOT a ring species!
Ring species – Do they exist in birds? - ScienceDirect
Wild Georgia column
Evolution - A-Z - Ring species
The herring gull complex is not a ring species
Similar Species to Ring-billed Gull, All About Birds, Cornell Lab of Ornithology
Herring Gull I presume? | Scottish Wildlife Trust
European Herring Gull Lesser Black-backed Gull Ring species Cline, European Herring Gull, png | PNGWing
File:Ring species seagull.svg - Wikimedia Commons
Hinterland Who's Who - Ring-billed Gull
Ring species – Do they exist in birds? - ScienceDirect
What is a species? - YouTube
Evidence for Evolution (Is there a Pattern of Change?) - ppt download
The rise and fall of Ring-billed Gull - BirdGuides
Center for Wildlife - Did you know that there is no such thing as a "seagull?" It's true! Of the 16+ species of gull that can be found in Maine - none
The Herring Gull Complex (Larus argentatus - fuscus - cachinnans) as a Model Group for Recent Holarctic Vertebrate Radiations
The Herring Gull complex is not a ring species – Avian Hybrids
Evolution -- Zimmer's Gulls
The Herring Gull complex is not a ring species – Avian Hybrids
Ring species - Wikipedia
