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Recording the undersea three-dimensional bioacoustic sound field in real-timepromises major benefits to marine behavior studies. We describe a novelhydrophone array -- the hydroambiphone (HAP) -- that adapts ambisonicspatial-audio theory to sound propagation in ocean waters to realize many ofthese benefits through spatial localization and acoustic immersion. Deployingit to monitor the humpback whales (Megaptera novaeangliae) of southeast Alaskademonstrates that HAP recording provides a qualitatively-improved experience oftheir undersea behaviors; revealing, for example, new aspects of socialcoordination during bubble-net feeding. On the practical side, spatializedhydrophone recording greatly reduces post-field analytical and computationalchallenges -- such as the "cocktail party problem" of distinguishing singlesources in a complicated and crowded auditory environment -- that are common tofield recordings. On the scientific side, comparing the HAP's capabilities tosingle-hydrophone and nonspatialized recordings yields new insights into thespatial information that allows animals to thrive in complex acousticenvironments. Spatialized bioacoustics markedly improves access to thehumpbacks' undersea acoustic environment and expands our appreciation of theirrich vocal lives.

Whales in Space: Experiencing Aquatic Animals in Their Natural Place with the Hydroambiphone