AirPods chirp for several reasons related to hardware, software, and security features. A common cause is Apple's anti-stalking feature: if the AirPods (especially AirPods Pro 2 or AirPods with Find My integration) become disconnected from their paired device (due to Bluetooth being off or lost connection) and are detected moving nearby another iPhone, they emit a chirping sound to alert the user that an unknown device may be nearby. Other reasons for chirping include low battery warnings (a tone at 10% battery and before dying completely), connection issues or software glitches, and sounds emitted by the Find My app when locating the AirPods. There are also reports that chirping may happen if the AirPods are physically moved or brushed together while in Transparency mode due to microphone amplification or if the silicone tips are attached improperly causing issues with fit and sound. Users can often stop unwanted chirping by making sure Bluetooth is enabled on the host device and the AirPods are properly connected, disabling charging case sounds in settings if relevant, resetting or re-pairing the AirPods, and ensuring the silicone tips are correctly attached. In summary, AirPods chirp mainly as a safety alert for tracking devices, battery alerts, or connection notifications, but can also result from physical or software issues.