Source: Bestiary 3, pg(s). 193
A basilosaurus resembles a greatly elongated whale measuring 60 feet, but with long, toothed alligator-like jaws. Inexperienced observers often confuse a basilosaurus with a sea serpent or water orm.
Basilosauruses locate prey with echolocation and vision, but sometimes mistake smaller ships for food. Basilosauruses are apex predators: a fully-grown one is only threatened by supernatural monsters like krakens, thalassic behemoths, and the largest sea serpents.
- Wikipedia:Basilosaurus (extinct real-world animal)