Answer:
They come out at night without being called, and are lost in the day without being stolen. What are they?
What hangs in the sky by day but at night goes away?
What do you have in December that you don't have in any other month?
What has a ring but no fingers?
How many months of the year have 28 days?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.