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

Language learning app Duolingo revealed this week that the bright green owl that was the face of the company has "died," in a viral social media stunt. Duo, who was known for his menacing reminders to get people to keep up with their lessons on the app,

Duolingo’s Duo the Owl, an internet-famous big green bird, was killed by a Cybertruck in an apparent marketing stunt orchestrated by the language-learning app this week.