Chapter 2, Part 6C - Lieh Tzu

There may be similarity in understanding without similarity in outward form. There may also be similarity in form without similarity in understanding. The Sage embraces similarity of understanding and pays no regard to similarity of form. The world in general is attracted by similarity of form, but remains indifferent to similarity of understanding.

Those creatures that resemble them in shape they love and consort with; those that differ from them in shape they fear and keep at a distance. The creature that has a skeleton seven feet long, hands differently shaped from the feet, hair on its head, and an even set of teeth in its jaws, and walks erect, is called a man.

But it does not follow that a man may not have the mind of a brute. Even though this be the case, other men will still recognize him as one of their own species in virtue of his outward form. Creatures which have wings on the back or horns on the head, serrated teeth or extensile talons, which fly overhead or run on all fours, are called birds and beasts. But it does not follow that a bird or a beast may not have the mind of a man. Yet, even if this be so, it is nevertheless assigned to another species because of the difference in form.
~ Lionel Giles translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Lieh Tzu.