Horace Slughorn: "Listen m'boy: in the old days, I used to throw together the occasional supper party. To the select student or two. Would you be game?"
Harry Potter: "I'd consider it an honour, sir."
Horace Slughorn: "You'd be welcome too, Granger."
Hermione Granger: " I'd be delighted, sir."
Horace Slughorn: "Splendid! Look for my owl. Good to see you, Wallenby."
Horace Slughorn invites Harry Potter and Hermione Granger to a supper party, and neglects Ronald Weasley[src]

This owl belonged to Professor Horace Slughorn. He used it to send his messages to the Slug Club in both tenures as Potions Master at Hogwarts School of Witchcraft and Wizardry. Barnabas Cuffe would always be happy to take the owl to hear Horace's point of view on the day's news in the Daily Prophet.