Translations:Beluga whale/45/en

Researchers record belugas with hydrophones, inspect waveforms and spectrograms, measure features such as duration, peak frequency, bandwidth, contour, and pulse-repetition rate, and compare those measurements with observed behaviour. Passive acoustic recorders can operate when visual surveys are impossible, revealing seasonal presence and calling activity. Tags carried temporarily by a whale can add movement and received-level data, while synchronized hydrophone arrays can help localize a caller.