Answer:
What has two legs but doesn't walk?
Hard to catch, easy to hold. Can't be seen, unless it's cold.
Runs smoother than any rhyme, loves to fall but cannot climb.
What stays the same size no matter how much they weight?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
I have two bodies joined together as one. When standing still I run and run.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?