Here's what alberta reg's say
All birds are protected except the following: Starlings, Crows, Pigeons, House (English) Sparrows, Magpies, Blackbirds, Common Grackles, Brown-headed Cowbirds, Ravens (hunted on private land by residents) and any other birds for which an open season has been declared by the regulations as indicated in the summary.
Nearly identical to BC regs.
Until fairly recent years, all raptors, including eagles in BC, and ravens could be shot at any time. The provincial game departments, encouraged the shooting of these birds.
As a boy growing up in bushland Saskatchewan, I was once walking the final steps to home from school one late fall afternoon, when I saw two grouse in a tall poplar tree, eating the buds.
I quickly got the 22 and was just starting toward the grouse, when a Great Horned Owl swooped in and took a grouse, right in front of my eyes.
Presto. War was just declared on great horned owls! Over the next couple of years I shot quite a few.
A little later I was at a meeting of the Nipawin Fish and Game Club. Guest speaker was a game warden and his speach was about encouraging all of us to shoot every hawk or owl we could, because of the severe damage these predators did to small birds and game birds. The game warden encouraged us to always carry a gun in the vehicle with us, for just such a purpose.
In later years in BC I was riding with the senior game warden of the area, on a bush trail. I had my 30-06 beside me in his vehicle. A large hawk flew up and landed in a tree. The warden stopped and said to me, "Get him."
I got out, leaned against a tree and the hawk virtually exploded.
"Good shot," stated the game warden.