Kingdom Animalia

While you're examining your old body, looking for a clue towards what you should transform into, you momentarily become conscious of your pulse and how warmth rushes through your veins. It sure is nice to have a circulatory system like yours. Maybe the change needn't be too big - you'll stay a warm-blooded animal. Something needs to give, though, somewhere in the body that you live in. What is your goal?