In 2014, Duolingo decided to "gamify" their mascot, making him cuter and more animated, according to Apple Developer. By 2018, the Duo the Owl users know and love (or fear) was released.

In a post on X Tuesday, Duolingo wrote: “It is with heavy hearts that we inform you that Duo, formally known as the Duolingo Owl, is dead. “Authorities are currently investigating his cause of ...