A couple of streaming services have "videos for cats." Basically, they put some birdseed on a log and record the results. This worked very well for us on the wall-mounted TV; he's been enthralled for hours. Unfortunately we also discovered that our cat (while adorable) is an idiot. He doesn't quite get the idea that the birds aren't in or behind the screen. The goofball nearly got himself killed knocking the upright TV over in an attempt to capture a canary the size of his head.