(CNN) — Duo, the green cartoon owl mascot for language learning app Duolingo, has mysteriously died, and singer Dua Lipa is grieving. CNN — (CNN) — Duo, the green cartoon owl mascot for language ...

Duolingo's mascot faked his death to get users to do their daily lessons, and attention from pop star Dua Lipa. Here's how he masterminded it —... Call it a miracle, or a marketing ploy: Duo the owl ...

Duolingo's mascot faked his death to get users to do their daily lessons, and attention from pop star Dua Lipa. Here's how he masterminded it — and why one expert sees the campaign as a success.