What carnivorous birds exist in Canada?

Yes. Many species including:

Goshawk

Cooper's hawk

Sharp shinned hawk

Red Tailed hawk

Rough legged hawk

Golden eagle

Bald eagle

Peregrine falcon

Kestrel

Merlin

Gyrfalcon

Red shouldered hawk

Broad winged hawk

Osprey

Northern harrier

Swainson's hawk

Great gray owl

Barn owl

Barred owl

Screech owl

Hawk owl

Horned owl

Short eared owl

Long eared owl

Snowy owl