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

该图片或媒体为美国国家公园管理局雇员在执行公务时创建。作为美国联邦政府的作品，此作品在美国境内属于公有领域。更多信息请参考美国国家公园管理局网站及美国国家公园管理局版权政策。