…whence I came: that the first of these expedients was utterly rejected by all the Houyhnhnms who had ever seen me at his house or their own; for they alleged, that because I had some rudiments of reason, added to the natural pravity of those animals, it was to be feared I might be able to seduce them into the woody and mountainous parts of the country, and bring them in troops by night to destroy the Houyhnhnms’ cattle, as being naturally of the ravenous kind, and averse from labour."
There are no more uses of "ravenous" in the book.
Show samples from other sources
But Charlie Bucket never got what he wanted because the family couldn’t afford it, and as the cold weather went on and on, he became ravenously and desperately hungry.
Roald Dahl -- Charlie And The Chocolate Factory
But then the creature’s eyes are on me, bright and ravenous.