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,

Duo, also known as the Duolingo Owl, has died, the language-learning app confirmed on social media. While they didn’t share what happened, they shared that there is “an ongoing investigation.”

Duolingo, the language-learning app, killed off its owl mascot named Duo on Tuesday in what is assuredly some kind of publicity stunt. In fact, here were are writing about it. So, well played, Duolingo.