Answer:
I have two bodies joined together as one. When standing still, I run and run. What am I?
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
Forward I am heavy backward I am not. What am I?
I am not very commonly found! Only in some rainforest! I have an odd number of toes! I'm very lazy and hang upside down! What am I?
I go up when the rain comes down. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.