👉 Heliocauins are small, round-shaped animals that are part of the order Cetacea, a group of marine mammals. These creatures typically have a long neck and a flattened head with a wide, flat nose. They belong to the family Loricariidae, which includes a variety of species including the baleen whale (Haliaeetus leucocephalus) and the killer whale (Balaenoptera musculus).