...whose feet are tied together with a golden string.
A short time later, the bird begins to sing. When it is ready to fly, just tell the Osiris Bird where you want it to go. It will sit on a ledge and listen. When it returns, it will give you a full report. Others will hear a birdsong; you will hear the conversation it overheard.
When you are done, wrap the golden thread back around the bird's feet. Be sure to feed it seeds or a juicy worm before you put the string around its feet, though. Birds like this sleep best on a full stomach. On an empty one, its spirit takes flight. Once the Osiris Bird is fed and its feet are tied, it will desiccate and re-mummify in a few minutes. Wrap it carefully. If you are going on a long journey, use a casket like this one to store the bird safely.