In Ancient Greek mythology there is a sea dragon called ketea (singular ketos).
They are amphibious and have two flippers instead of legs. They have sleek bodies with hides covered in barnacles, and a long, tapering tail with a sea-weed like end.
Ketea have a long, pointy snout, long ears, sharp horns on their heads, and small sharp teeth. Although they live in the ocean around Greece, they can also survive on land.
Ketea obey Poseidon, Greek god of the sea, and he sends them to punish people who have offended him. They are ravenous and can never get enough to eat!
If you enjoyed this post and want to read more, you can find out more about dragons in The Dragon Companion: An Encyclopedia by Carole Wilkinson. All the facts in this post were taken from this book.
Some new books about dragons that you might like to read are: