Answer:
A prehistoric reptile that lives today and the inspiration for the name of a popular sports drink.
Which weighs more? A pound of iron or a pound of feathers?
If you have me, you want to tell me. If you tell me, you don't have me.
What can get you there in eco style, pushed by your legs mile after mile?
Mouth up it gets filled, mouth down it gets empty.
It is something you will never see again.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?