Duo, the Duolingo owl mascot, is depicted as crying primarily as a marketing and engagement tool. This is not because the owl is actually sad but to create an emotional connection with users by threatening their language learner identity. The crying Duo symbolizes users' fear of losing their language skills if they skip lessons, which psychologically motivates them to return to the app. This emotional strategy goes beyond simple guilt, tapping into users' desire to protect their identity as language learners. Additionally, some users interpret Duo's tears as part of Duolingo's playful and creative marketing, including stunts like announcing Duo's "death" or changing his icon to express different moods to draw attention and engagement from the audience. The emoji-like crying can also reflect users' feelings of guilt or nostalgia when they return to Duolingo after a break, reinforcing emotional bonds with the app and motivating continued language study. Thus, Duo is crying mainly as a symbolic and strategic feature of Duolingo's app experience to encourage user retention and engagement through emotional impact, rather than literal sadness or a technical issue.