Knock Knock Bird

You can pull the rope and the bird's beak will hit the wooden stake to make a sound, which plays the role of knocking on the door.

Maybe tree solid printing can get better sound

敲门鸟

可以拉动绳子，小鸟嘴巴敲打木桩发出声音，起到敲门的作用

也许树状实心打印可以获取更好听的声音