The Animal Kingdom
"With that great hierarchical unit which we call the animal kingdom, the third kingdom in nature, man is definitely related through the medium of his animal, etheric and astral bodies. He is also related to the kingdom of souls, because his own soul is an integral part of that kingdom, just as his physical body is an integral part of the animal kingdom. The aspect of himself which is strictly and specifically human is the mind or mental body; this is essentially the organ of relationship to all other human races." EDUCATION IN A NEW AGE by Alice Bailey.