Owl's question?

WHO

This two-letter word is what a curious bird of prey might hoot—or what you’d ask when seeking someone’s identity.

This clue plays on the classic stereotype of owls saying "who" instead of hooting—like the sound you hear in cartoons or kids' stories. The question mark hints it’s a pun, turning the owl’s noise into a literal question ("who?"). It’s a lighthearted way to clue the word "WHO," relying on the familiar cultural shorthand for owl sounds.