Reactions of captive harbor porpoises (Phocoena phocoena) to pinger-like sounds

Teilmann, J., Tougaard, J., Miller, L.A., Kirketerp, T., Hansen, K., Brando, S.
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Marine Mammal Science
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Two captive harbor porpoises were exposed to three sound types (frequency from 100 kHz to 140 kHz, 200 ms long, and presented once per 4 s). Each session consisted of a 10 min period persound, a 5 min period of sound, and a 10 min period after the sound. Behavior was recorded on video and with dataloggers. Animals reacted most to the intial presentations of sound, but the reactinos diminished rapidly in repeated sessions.