Duolingo (DUOL) just made another move to strengthen what keeps its users coming back. The company recently acquired Animade, a London-based animation and motion design studio known for character animation and playful, interactive design. The deal folds Animade into Duolingo’s growing Design Studio. On its own, a small animation acquisition might not seem like much. But it fits neatly with how Duolingo believes it continues to grow. The company’s whole model runs on engagement. Its cast of characters, streaks, and animations are what make lessons feel like a game rather than a chore. Buying a studio built around exactly that kind of work feeds directly into the product experience that keeps users hooked on Duolingo.