These birds offer unlimited weight when transporting materials like metal across the map. You can place a bed near a safe location to harvest metal like the dwarven mine and fast travel there with a cryoppoded metal farmer and go to town on the metal putting it into a storage unit when you become encumbered until you have all the metal you want and then throw it out of the storage and pick up all the metal you want before killing yourself with organic polymer or fast-traveling to your base slot-capped with metal to put in your forge. You can do this to get an abundance of any material.