@izzythepush,
Gulls are a bunch of birds that most people dont appreciate. The Blackback, (the world's largest gull) is a yr round resident of Eastern N America , Greenland, and "Doggerland Europe"(includes the low countries and NW France)
These bad boys are like crows, that bikers of the bird world. Qt this time of year we see them in Walmart Parking lots and they create a major problem at airfields. They can be the size of Snow Geese and qre pretty damn fearless.
We have several feeding stations set up for wintering bluebirds in a small paddock are and the Black-backs have consistently torn the damn thing apart for the raisins and orange slices . The GH Owls nd Coopers hawks have dive bombed the gulls and At least one gull was eaten in a fashion that was indicative of a Cooper Hawk. (They leave a "puddle of feathers" where they stoop qnd kill smaller birds like barn pigeons,
Ive seen black-backs as far west as Pittsburgh .They seem to wander afield from the Ocean and the Great Lakes.