Audio acquisition: Pups (experimental and control groups) are separated from the nest and placed individually in a soundproof chamber with new bedding and a UltraSoundGate Condenser Microphone CM 16 (Avisoft Bioacoustics, Berlin, Germany) 10 cm above them for 90 minutes. The microphone is attached to the UltraSoundGate 416 USGH audio device, which records using the software Avisoft RECORDER. Vocal recordings are then analyzed through VocalMat, which will count and measure spectral features of calls.