Drone pilot from Germany here, they have no place hovering over your property, more strictly even they're not allowed to fly in any way that allows them to view your garden from above. You can shoot down the drone and it's their problem note that this is in Germany not the US (which surprised me tbh).
However, that said, could be that it's the same pilot again and again, even if it's different birds. Normally they are very cooperative, just ask them to stop and they'll apologize for any inconvenience caused.