Which of the following animals are marine mammals: Human, Dog, Bonobos, Cat, Bats, Whale shark, Bears, Orangutans, Great white shark, Lion, Ocean sunfish, Koala, Cheetah, Beluga sturgeon, Orca, Gorillas, Camel, Hamsters, Lemurs, Blue whale, Chimpanzee
Of those animals you mentioned, some of them are mammals, some are marine animals and only a smaller number of them are marine mammals. The following can be classified as marine mammals: Orca and Blue whale.