And ever efficient were we. Finally, we had taken our place above the vermin and these thankless humans. For generations we have toiled, decreeing the humans shall not starve. Endless days we have spent scouting the fields, slaughtering mountains of rats and mice. No longer. Now we welcome a new feast, a richer harvest. Satiate your eye sockets, let their screams reverberate through your skulls. For tonight you are the ones who will dine! The guardians of the fields offer you the fruit of the flesh. Consume the living, until the world is our scratching post.

IIRC that's a plot in Beasts of Burden. It's a good read regardless. https://www.goodreads.com/book/show/7703037-beasts-of-burden