Answer:
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
What has a single eye but cannot see?
They can be harbored, but few hold water. You can nurse them, but only by holding them against someone else. You can carry them, but not with your arms. You can bury them, but not in the earth.
Who works when he plays and plays when he works?
I can be moved. I can be rolled. But nothing will I hold. I'm red and I'm blue, and I can be other colors too. Having no head, though similar in shape. I have no eyes - yet move all over the place.
I am a animal that is cute but dangerous, what am I?