You can let them have the whole head. It will give them something to work on. That is what I usually do, if the wild birds have left any on the heads from my garden. You can also hang them someplace to store if for latter if you have the room.
I actually give mine the whole plant...
Heat the nesting boxes to stop eggs from freezing.
Forever Water Heater one that lasts.
Unfrozen Nipple Watering for those cold days.
Removing dust the easy way.