Here's a similar joke:

A young turkey took up refuge near a cattle ranch, and lived a long life, always surving hunting season year after year, living in a single tree near the pen of the breed bull. Every year the other animals would see the turkey feeding in the pen of the breed bull and every year the turkey would move higher in the tree it lived in. Years and years passed and the turkey finally lived on the top branch of the tree. One day a young turkey found the old turkey dead at the bottom of the tree. He asked the breed bull, "What happend to the wise old turkey?" The breed bull answered, "I don't know, but it looks like bullsh!t will get you to the top, but bullsh!t won't keep you at the top.