Huh this is news to me. My field guides all mention the color variation but don’t mention differing behavior. One guide even incorrectly says its based on age (it is worth noting they do vary in plumage depending on age, but in a different way).
Another bird that is sort of like how they describe in the article is the Ruff. It is a beautiful type of sandpiper where males are split into 3 categories with different appearance and behavior.
Most people seem surprised to learn they live for 30+ years
I saw a Kittiwake gull in Florida once and then the same year visited their nesting grounds in Iceland. I can’t believe such a tiny little bird can fly that far and survive. That being said the one in Florida was probably lost lol
Yeah I have heard lots of birders say that but its just a synonym for “gull”, I don’t see why its bad. They mostly live by the sea, seems fitting to me.