examples of marine mammals 
Marine mammals: many actively hunted species (more than 110 out of 116) are protected or are subject to hunting restrictions.
Widespread swift aggressive marine mammal reaching up to 30 feet in length; it attacks mainly young whales and dolphins.
Mammal of arctic waters; the male, whose spiraled tusk can reach 10 feet in length, is hunted for its ivory.
Amphibious marine mammal of arctic regions; it is hunted for its hide, blubber and ivory tusks.
Marine mammal of the polar and subarctic regions emitting various whistles to communicate, hence its nickname "sea canary".