Three Causes For The Different Species

“When one can see that the various bodies of living entities arise due to the different desires of the individual soul and do not actually belong to the soul itself, one actually sees. In the material conception of life, we find someone a demigod, someone a human being, a dog, a cat, etc. This is material vision, not actual vision.” (Shrila Prabhupada, Bhagavad-gita, 13.31)