Sea-dragon
a large, dragon-like creature inhabiting the waters of Drexel One, a planet in the Drexel System. They are intelligent creatures that communicate over ultra-sonic frequencies. The sea-dragons accepted and even welcomed the Dragon Lords when the humans were first exiled, and agreed to help them overthrow Quarg. The baby dragons were used as spies. Quarg used a sonic jammer to injure the sensitive hearing of the sea-dragons, but Han Solo managed to destroy the weapon before it could do serious harm.