I volunteer with an education program at a prison. Clear sight lines from the guard towers being essential in a prison, there isn’t much cover, so there aren’t many birds. I’ve seen House Sparrows and Mallards and pigeons. The inmates report that seagulls are prone to getting caught in the barbed wire that tops the fences. The inmates don’t have much sympathy for the seagulls, since they’ve had to try to protect Mallard ducklings from marauding seagulls in the past, generally unsuccessfully.
Recently I saw a Red-winged Blackbird and a Common Starling both trying to claim the same bit of fence as their own. I can’t imagine why they wanted the fence (perhaps so that they could listen in on our class and learn how to solve “3 is 60% of what?”, too?), but it was exciting to see them. Serious birders have state bird lists; I don’t have that, but I do have a mental prison bird list, and both of those species were firsts.