Duo the Owl was known for his silly antics, reminding Duolingo users to complete their daily lessons. He debuted with the app in 2011.

Language learning app Duolingo has revealed that after many years of pestering you to learn your lessons, their owl mascot Duo is dead. There is little information currently, but they said “Authorities are currently investigating” his cause of death.

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. Duolingo posted the news on social media.

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.”

The Duolingo Owl is dead, according to a statement from the Pittsburgh-based company. "It is with heavy hearts that we inform you that Duo, formally known as The Duolingo Owl, is dead," the language learning app posted on social media Tuesday morning.