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
Marine mammal observer Marine mammal observer A marine mammal observer (MMO) is a professional in environmental consulting who specializes in whales and dolphins. In recent years there has been increased concern for the effect of man-made noise pollution in the ocean, particularly upon cetaceans - which are known to be sensitive to sound. As a result, environmental regulations have been introduced in an attempt to minimise negative impacts on marine wildlife. These guidelines have focused on the oil industry's seismic exploration for offshore oil. They center on the practice of delaying or shutting down the use of air-guns if a whale or dolphin