What's the sign in the Lingbird?

When a lark is very young, if it is not allowed to eat, it will be hungry. Fix the grain above the label where the lark can see it. Open and close the cage door, and the hungry birds will pick up the fixed grains, thus completing the lark's tag-picking game. It takes a long time to train birds, and the color of props should be close to that of grains. It is more ornamental to train larks to sing before signing a contract.