Thanks for reaching out to Ask Lafeber. A young lovebird that suddenly avoids flying but still eats and vocalizes is often dealing with a mild wing or shoulder strain, early fatigue from a growth spurt or molt, or temporary stress from something in the environment. A strain is the most common cause—he may fly a little but prefers to perch, avoids full wing extension, or climbs instead of flying. Molting can also make flight tiring, especially if you see pin feathers or extra napping. Illness is less likely if he’s bright, vocal, and eating, but you should still watch for red flags like fluffed posture, tail bobbing, breathing changes, or clumsy landings. For now, let him rest for 24–48 hours, avoid triggering flight, keep him warm around 80–82°F, and watch whether one wing sits lower or moves differently. If he still avoids flying after two days or shows any wing drooping, swelling, or pain, an avian vet should check him to rule out an injury.