Yes, corner beads for drywall.
I don't know any way of keeping birds away from plants... I can tell you how to do it for dogs and cats but not birds because, if they like them, they will chew them no matter what you do. I used to hang spider plants for them in the birdroom and they used to chew them all the way down to the root -but that was the purpose of them been there so I did not mind, of course.





