Instruction :
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

Response:
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.