The Family Monodontidae includes large, toothed whales such as the narwhal (Monodon monoceros) and the beluga whale (Delphinapterus leucas). These marine mammals are adapted to Arctic and sub-Arctic environments, with thick blubber for insulation and specialized echolocation for navigating and hunting in icy waters. Narwhals are famous for the long, spiral tusk found in males, while belugas are notable for their white coloration and vocal communication, earning them the nickname "sea canaries". Monodontids primarily feed on fish, squid, and crustaceans, and they are highly social, often forming pods that aid in hunting and protection. Their ecological role includes maintaining balance in marine food webs and serving as indicators of ocean health in polar regions.