Answer:
What is it that given one, you'll have either two or none?
I know a word of letters three, add two and less there will be.
What is it that leaps and runs and yet, has no feet?
If you need a night out, call one of these over to take the little ones off your hands for a while.
Once you have it, you want to share it. Once you share it, you donβt have it. What is it?
The strangest creature you'll ever find: Two eyes in front and many many more behind.