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

Not every mascot is a gem and a hit that lives on for generations. Some are downright weird and, truth be told, creep us out. With that said, many weird and unconventional mascots are beloved by ...

Two weeks after Duo the Owl's demise, Duolingo's language learning app's mascot admitted that "faking my death was a test." ...