Source: http://www.nps.gov/glba/InDepth/learn/preserve/projects/acoustics/sounds/

"The recordings available here were made by the National Park Service, using a hydrophone that is anchored near the mouth of Glacier Bay, Alaska for the purpose of monitoring ambient noise. "

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The recording location indicates that the community of orcas involved is either the Southern Alaskan Resident Killer Whales, or the Bigg's Killer Whales. Here is a link to a relevant NPS article regarding the populations in the area: https://www.nps.gov/articles/killer-whale-population-assessment.htm

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