Marine mammal Marine mammal Marine mammals are aquatic mammals that rely on the ocean and other marine ecosystems for their existence. They include animals such as seals, whales, manatees, sea otters and polar bears. They do not represent a distinct taxon or systematic grouping, but rather have a polyphyletic relation due to convergent evolution, as in they do not have an immediate common ancestor. They are also unified by their reliance on the marine environment for feeding. Marine mammal adaptation to an aquatic lifestyle varies considerably between species. Both cetaceans and sirenians are fully aquatic and therefore are obligate water dwellers. Seals
The Marine Mammal Center after the closure of the missile site. Underground silos now house the facility's water filtration system. A small structure nearby was once a guard house. The exterior remains unchanged but it is now part of the Harbor Seal Hospital and also holds a surgical suite. Neither the former silo, nor the former guard house are open to the public. The Marine Mammal Center is entirely privately funded. In 2012, the yearly operating budget for the center was approximately $7,500,000. 81% of expenditures went directly to animal care, veterinary expense, and education programs. In 2012, 76% of the Marine Mammal Center's