Duo is apparently now dead. "It is with heavy hearts that we inform you that Duo, formally known as The Duolingo Owl, is dead," said a post on Instagram. "Authorities are currently investigating his cause of death and we are cooperating fully.

Duo was fatally hit by a Tesla Cybertruck, the language-learning company announced this week. The snarky owl has been the face of Duolingo for over a decade. Why his sudden demise, and what's next?

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