Answer:
What is it that has four legs, one head, and a foot?
What bird can lift the heaviest weight?
Until I am measured I am not known, Yet how you miss me when I have flown.
What covers its face with its hands, speaks no language, yet most known what it's saying?
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
People take me on walks and I run and have fun. What am I?