My MOB rant is about hosepipe connectors. The hozelock type that you screw onto the tap.
Someone is going around the allotment and stealing them! I took to hiding one under my water tanks and they've even taken that one! I know they're not expensive, but when you're all set up with hose and have a tap available it's very frustrating to then have to go shopping for another connector. Especially when you get back and find the tap is now in use for the next two hours. I am now taking it home, but it's yet another thing to remember to take with me.
The only birds I have issues with are pigeons - they totally stripped (I mean everything) my OH's runners and pumpkins on one plot. She was not best pleased. The seagulls seem to be able to target our two kids which is often very funny.