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

Esta imagem ou ficheiro multimédia tem conteúdo baseado numa obra de um empregado do Serviço Nacional de Parques dos EUA, criada no âmbito dos deveres oficiais dessa pessoa. Por ser uma obra do governo federal dos EUA, ela está no domínio público nos Estados Unidos. Para mais informações, consulte NPS website e NPS copyright policy.