I have an important job to do, but I do not have any use for pay. I am known for standing very still, and my emptyheaded ways.

From a canyon you hear me yell you may not see me but you know my smell

What is round on both sides and has a high in the middle?

I’m black and white, I’m cute but I’ll fight. I roll around with little care, You might want to hug me but you shouldn’t dare.

I roast, I deflate, I deconstruct, yet can elevate. I evince lessons not yet taught. To avoid me, do naught.