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
Australian Fossil Mammal Sites (Riversleigh / Naracoorte) Australian Fossil Mammal Sites (Riversleigh / Naracoorte) Australian Fossil Mammal Sites (Riversleigh / Naracoorte) is a combined listing in the UNESCO World Heritage Sites for two places in Australia known for their extensive fossil remains. The UNESCO listing is for two separate areas where fossils from the Cainozoic era have been found: Riversleigh and Naracoorte are considered to be among the world’s 10 greatest fossil sites and both locations are notable for the extreme diversity and quality of preservation of their fossils, which illustrate the evolution of mammals in Australia over the last 20 million years and demonstrate how marsupials