Glaucous Gull - eBird
Herring gull - Bird Aware Solent
California Gull Identification, All About Birds, Cornell Lab of Ornithology
Gull - Wikipedia
Common gull - Wikipedia
Western Gull Identification, All About Birds, Cornell Lab of Ornithology
European Herring Gull - Tierpark Hellabrunn
Ring-billed gull | bird | Britannica
Showy American Herring Gull in Cornwall - BirdGuides
Gulls choose what to eat by watching humans, study suggests | Science | The Guardian
Common Gull - eBird
Kelp gull – Australian Antarctic Program
Just for the gull of it!
Gull - Sierra Club BC
Herring gulls have clever tricks and adaptations that feed it well on worms, rats, our french fries - Cambridge Day
Identification Guide to Winter Gulls - Part 2 - WingSearch2020
Ring-billed Gull - American Bird Conservancy
Advice on how to deal with problem gulls - GOV.UK
Know Your Gulls: A Very Basic Guide To Identifying Our Local Gulls - International Bird Rescue
Ring-billed gull - Wikipedia
Glaucous Gull Overview, All About Birds, Cornell Lab of Ornithology
Glaucous-winged Gull, Western Gull, Herring Gull — Eastside Audubon Society
Red-billed Gull | Tarāpunga | New Zealand Birds Online
Gull | Seabirds, Migration & Adaptations | Britannica
Common Gull Facts | Larus Canus - The RSPB
Gull | Seabirds, Migration & Adaptations | Britannica
