Duolingo Trivia

What kind of animal is Duo, the green mascot of Duolingo?

What term describes Duolingo's strategy of using streaks, leaderboards, and virtual rewards to make learning feel like a game?

Duolingo offers free core language courses but charges for its Plus subscription with ad-free access and extra perks; what business model is this?

Which fictional Game of Thrones language, known for phrases like valar morghulis and dracarys, can you learn for free on Duolingo?