Several years ago I read an interesting hornbill fact in this book: https://www.amazon.com/Kicked-Bitte...2&sr=1-1&keywords=kicked+bitten+and+scratched. It stated that Hugh Hefner's Playboy Mansion had a private zoo with its own curator who was very successful in raising hornbills that are very rare in captivity. If I remember correctly they had at least a dozen species. Not sure where they all ended up.
Supposedly they are still there.