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

Duo the Owl has mysteriously died, the language-learning platform announced in an unexpected update.

Language learning company Duolingo has announced the death of its mascot, the Duolingo Owl. A bizarre statement shared on their social media accounts read that ‘Duo’, the owl at the centre of the brand (and countless internet memes), is dead – and authorities are investigating his death.