Ah, but you're implying that man isn't an unthinking animal. I'm sure you would concede that sentience is a gradient, but you're making it seem as if it's either present or absent.
I'm sure Ayn Rand would agree with you. However I support stricter categories. Here is my reasoning:
Obviously, as new human beings, we do not start out with equal rational faculties. But it is important to note that while rational faculties are not even among men, they are *evenly distributed* (in a large enough sample size.) Same with sex, height, and build.
Thus, biologically speaking, we can point to this distribution and say this is man's sentience or "capacity to reason", all other factors being equal.
If we do the same for another population (I.e. another species) we find that the even distribution of the sentience (or lack thereof) of that population is so far disjoint from the human population as to make the two independent categories.
The concept of sentience in the first place, derives from the disjointness of these distributions -- If everything were equally sentient we would not have a term to describe sentience, and if everything coexisted randomly on a continuous scale of sentience then we would likely not have the concept of animal, it would be just: smart, dumb, dumber, and so on.
So yes I am fully implying that man isn't an unthinking animal in any sense. I would say that the concept of animal does not apply to men in the first place:
To say "man is an animal" is mixing definitions. In common usage the concepts of "animal and nature" are mutually exclusive with the concept of "man and production". While it is correct in scientific language to call man a rational animal, there is little purpose in doing so, as by the general definitions it serves only to obfuscate the distinction between man and animal, and ultimately serves only to erode the foundations of interpersonal standards of behaviour (ethics.)
It is patently obvious that man and animal are distinct categories; Joining ontological categories which don't go together is generally as bad as separating categories which do. E.g. one could join the categories of food and poison and wind up dead, likewise one could separate the category of breathable air into toxic and nontoxic and end up self-suffocating for lack of "nontoxic" air.