“According to less intelligent philosophers, animals have no soul. But factually animals have souls. Due to the animals' gross ignorance, however, it appears that they have lost their souls. Without the soul, a body cannot move. That is the difference between a living body and a dead body. When the soul is out of the body, the body is called dead. The soul is said to be lost when there is no proper knowledge exhibited. Our original consciousness is Krishna consciousness because we are part and parcel of Krishna.” (Shrila Prabhupada, Shrimad Bhagavatam, 4.22.31 Purport)