What is a species? - YouTube
The Herring Gull complex is not a ring species – Avian Hybrids
Ring species - Wikipedia
PPT - Biology 3.5 PowerPoint Presentation, free download - ID:3026695
Evolution 17
The rise and fall of Ring-billed Gull - BirdGuides
Black Swamp Bird Observatory - What better way to start the new year strong than with a bit of gull appreciation! This group of birds bears a reputation of frustration and confusion,
The herring gull complex is not a ring species
The Herring Gull Complex (Larus argentatus - fuscus - cachinnans) as a Model Group for Recent Holarctic Vertebrate Radiations
Wait – that's NOT a Seagull? - MSU Extension
Evidence for Evolution (Is there a Pattern of Change?) - ppt download
The Herring Gull Complex Is Not a Ring Species
Ring species – Do they exist in birds? - ScienceDirect
Hinterland Who's Who - Ring-billed Gull
Evidence for Evolution - page 10
The Herring Gull complex is not a ring species – Avian Hybrids
Evolution - A-Z - Ring species
Similar Species to Ring-billed Gull, All About Birds, Cornell Lab of Ornithology
Examples of phenotypic variation within the herring gull complex. (a)... | Download Scientific Diagram
Evolution -- Zimmer's Gulls
Birds of a feather dont breed together
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 – Do they exist in birds? - ScienceDirect
