Humans have a tendency to anthropomorphize animals,and to spiritualize them too. Students of animals try very hard to resist those natural inclinations. Animals lack personalities, self-awareness, etc. Those of a species are identical robots, maybe, until you get to the apes.
An animal researcher discusses his challenge in objectifying creatures: The minds of other animals. Animal consciousness is taboo in many areas of biological science. What’s so hard about the inner lives of other species?
I recall Darwin's other classic text, The Expression of the Emotions in Man and Animals. Do people still read it? We did, at least selections from it.