Its legal because - as with all corvids I believe (but stand to be corrected) - they're classed as vermin. They certainly do a job on songbird eggs and chicks!
not anti hunting in anyway shape or form but think now the idea that magpies and other corvids ar concidered to be fairly blameless
when put up against the damage grey squirrels, cats, enviromental damage ect. They dont course anywhere near the amount of damage as was once thought.
But yup ther fair game and legal to shoot so why not. I dont think id want too these days my self tho, magpies are such comical intelligent birds and
are amazing looking in the sunlight, the way they flair there tail and bob about, jays are gorgeous and just seem like they should be in the jungle
and jackdaws? well i feel a bit iffy shooting something you can teach to speak. Infact i watched a docu on animal intelligence not so long back
and a London university had done a study and now think most Corvids are capable of having the same problem solving skills as the average 7 year old child.
I guess its just about what you want todo