Using the Ladder Trap
Catch corvids en-mass.
The Solway Ladder Trap (also known as a letterbox trap) is our own take of the traditional method for catching crows and magpies which has been used across the country for the past century. It is a very effective trap with the capacity to catch dozens of corvids in one sitting yet light weight enough to be moved and set by one person (do this when a spot seems to be used up to maintain effectiveness).
Unlike Larsen traps, ladder traps don't use springs or any moving parts to catch birds. They depend on the same principle used in lobster pots, which allows birds in from outside but doesn't let them out from inside. The birds pop down through the ladder and then find that they can't physically fly vertically back up through it.
Ladder traps work best with a live call bird though they can be pre-baited before setting. As for location; set in sight of a major nest and under the cover of darkness for the best results. If the birds see you removing birds from the trap, they may be more hesitant to enter it themselves. This goes for any escapees making it back to the flock too so check the trap for any damage between uses and make it’s on even ground that leaves no gaps to escape under.