1) Family monodontidae 2) Mammal family 3) Narwhals 
The cetacean family Monodontidae comprises two unusual whale species, the narwhal, in which the male has a long tusk, and the dorsal fin-lacking, pure white beluga whale. They are native to coastal regions and pack ice around the Arctic Sea, and the far north of the Atlantic and Pacific Oceans. Both species are medium-sized whales, between three a...
[n] - narwhals
family Monodontidae noun narwhals