Answer:
Only two backbones and thousands of ribs.
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around.
Late afternoons I often bathe. I'll soak in water piping hot. My essence goes through. My see through clothes. Used up am I - I've gone to pot.
Lives without a body, hears without ears, speaks without a mouth, to which the air alone gives birth. What is it?
I am a precious little thing, dancing and eating all the time. Watch me from a distance, so you can feel my warm and gentle love. But don't come to close or my next meal you could be!
People take me on walks and I run and have fun. What am I?