The bird's nest in Dark Souls 3 is very interesting. As long as you throw something into it, something else will pop out. However, because there is no prompt, you don't know what will happen if you throw something into it. It wasn't until other players tested them all that they came out. Check out the redemption catalog below.
1. Go to the roof of the Fire Sacrifice and walk near the bird's nest. You can interact only when you can clearly hear the sounds inside the bird's nest.
2. Open the player's backpack, click the left mouse button on the prop that needs to be exchanged, and in the pop-up menu, click to place it in place.
3. After placing the prop in place, the bird's nest will make a sound and a pickup mark will appear on the ground. If you pick it up near the prop, you can get the exchanged item.