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. "

Information presented on this website, unless otherwise indicated , is considered in the public domain. It may be distributed or copied as is permitted by the law. -- http://www.nps.gov/disclaimer.htm

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

This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.