Answer:
Only two backbones and thousands of ribs.
I am the third from a sparkle bright, I thrive throughout the day and night. Deep in the path of a cows white drink. I've had thousands of millions of years to think. But one of my creatures is killing me. And so the question I ask to thee, is
What is the smallest bridge in the world?
What is given but kept by the giver?
What begins and has no end? What is the ending of all that begins?
This small, round stone fruit that is typically bright or dark red, is often served on top of whipped cream on a milk shake.