Cats have bacteria in their mouths that can kill a bird if it is not treated with specialized antibiotics. Even if the bird doesn’t look injured, a small scratch or puncture can kill them. Do not try to treat the bird yourself. Call the BC SPCA Animal Helpline at 1-855-622-7722 for advice on bringing the bird to a wildlife rehabilitator.
Read more preventing problems between cats and birds, or about pets and wildlife (PDF).