Duolingo

Duolingo is a human pretending to be a bird, he owns an app called "Duolingo" just as his name, in his app you learn different languages, the Duolingo App gives you a lesson to do everyday. Duolingo has a green bird's head, he always wears it, it's cute little face, he has an elegant suit, and black elegant suit pants, with green bird hands [gloves] But when you don't do his lesson... he'll kill you. Good luck.