I forgot about those, then I went back and realized it was too dark for screens.
It is basically a courtyard, a building on one side of it, the rest of the sides are walls. Then two towers with a perching spot for birds.
The birds fly from tower to tower and 3 spots on the building, you pick them off as they fly by. You are given a shotty, 357, and the crossbow. There is also the physics cannon and a few "sanitary sewer" drain covers. Oh and a buggy for the birds that miss the tower and land on the ground somewhere outside of an ai_scheduledevent thing zone.
It is quite fun to have a flock of 20 birds with the crossbow zoomed in on them then fire and watch one get picked off.
If there arent any birds around they are probably perched, just fire a shotty round and they will all come flying. Try being quiet for a while, let them all get settled then fire and you'll have 50 birds in the air grouped very nicely.
5 points for crows (since they are harder to see and there are less of them) and 2.5 points for pigeons. Get 250 points for the special ending