Family Monodontidae, also known as the "Narwhal family," is a group of aquatic mammals that can be found in Arctic and sub-Arctic regions. These unique creatures are best known for their elongated tusks, which are actually a protruding canine tooth. Synonyms for the word "Family Monodontidae" include the Narwhal family, Narwhalidae, and unicorns of the sea. These synonyms reflect the mystical and awe-inspiring nature of these majestic creatures, which have long captured the human imagination. Despite their distinct appearance, Narwhals are closely related to Beluga whales and share many similarities in their biology and behavior.