Хүхэтэн: хубилбаринуудай хоорондохи илгаа

* [http://nlbif.eti.uva.nl/bis/marine_mammals.php Marine Mammals of the World]—An overview of all marine mammals, including descriptions, multimedia and a key, eti.uva.nl

* [http://www.mammalogy.org Mammalogy.org] The American Society of Mammalogists was established in 1919 for the purpose of promoting the study of mammals, and this website includes a mammal image library

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