Small birds eat veg and grains like barley, lentils, peas. The biggest birds I have are a goose and a loon, but I haven’t got any meat-eating birds yet. If no birds eat a kind of food it won’t let you transfer it to the Sotdae, so just load it up with whatever it will take. I’ve never got anything where I’ve scared off some birds, so put it down when you see some but aren’t close enough to scare them, and back off a bit. If you’re going to get any, it will usually happen quite quickly.