Currawongs are really smart, too (well, obviously, being so similar to our magpies). My nanna feeds the birds, so she has a family of magpies which live in the trees across the road and pay regular visits for food. I haven't seen any for years, but a while back she used to get currawongs coming across too. Once she was watching TV and didn't notice one was there, so it came up and tapped its beak on the glass door. When she went to open it, the bird hopped past her, hopped across the lounge room, and went all the way into the kitchen before tapping its beak on the fridge. I shit you not.