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Sirenians include the manatees and dugong. A recently extinct species was the Steller's Sea Cow.

Extant species are

* Hydrodamalis gigas (Dugong)
* Trichechus inunguis (Amazon Manatee)
* Trichechus manatus (West Indian Manatee)
* Trichechus senegalensis (West African Manatee)


Sirenian International. This site has news, information, and ways to get involved in Sirenian conservation. Caryn Self Sullivan heads this organization, and is a prominent researcher and Sirenian conservation activist.