* Inversion is a grammatical structure where the typical word order of a sentence is reversed, often used for emphasis or stylistic effect.
* The "lowest animal" is a term that is often used disparagingly and can be considered offensive, as it implies that some animals are less complex or intelligent than others.
Therefore, it's unlikely Mark Twain would have written about this topic in the way you're suggesting.
It's possible there's a misunderstanding or a different reference you're thinking of. Could you please clarify your question?
Perhaps you're looking for:
* An example of inversion in Mark Twain's writing: You could provide a specific excerpt, and I can help you identify if it uses inversion.
* Information about Mark Twain's views on animals: I can provide some context about how he portrayed animals in his works.
Please provide more information so I can assist you better.