(Sea)gulls

There used to be several kinds of (sea)gulls in Hastings, but these days I only see (and hear) herring gulls. I reckon they've chased away the beautiful little black-headed gulls and the striking-looking black-backed gulls.
I give a safety and orientation talk to new students on their first day at English for You. You know, advice like: keep your valuables in a safe place; don't gather in a group that blocks the pavement; use plenty of the free suntan cream on the Lifeguard Beach; think of interesting topics to discuss with your hosts; cross roads carefully, remembering that English people drive on the wrong side of the road, and so on. But now I add something new to the talk:
DON'T FEED THE (SEA)GULLS.
If you break off a piece of your sandwich and throw it on the ground for the gulls, you will immediately see gulls swooping down around you from all directions. And the mother gulls will squawk and scream at you if you go near their beloved enormous babies (the gulls with the brown and white feathers).
Don't even walk along eating a hamburger or an apple. If you do, a gull will swoop down and lift it from your hands.
Yes, these birds should be out fishing. But instead of paddling along in the sea and grabbing tasty fresh fish, they join the human queues at the local fish and chip shops.
The other horrible thing they do is to nest on roofs of Hastings buildings. Their nests block the gutters and cause the rain to travel down the inside walls, causing the walls to be damp.
And guess what: gulls are protected. 
Anyway, never throw a stone at a gull. Not only is it illegal, but also they can scream for their friends and family to take revenge on you.