The Yahoos live in the <span>Country of the Houyhnhnms (the country of intelligent horses).
The Yahoos are humanoid, meaning that they resemble humans slightly, even though they are not humans - they are animals. Covered in thick hair, standing on their hind feet, they do look somewhat like humans, but Gulliver says that he doesn't see the connection.</span>
The comma separates the sentence, allowing for the oh to have a sense of exclamation to it.
If this is how you've presented the question, Its a bit hard to answer it when one hasn't read these books. It'd be best if you'd put both books into a summary for us to go based off of, at most.