Legendary creature
A creature or animal whose existence is unverifiable but is prevalent in myths or legends.
Key passages
Gk Es 10:7

And the two dragons are I myself and Haman.

Sir 43:25

And the incredible and wondrous works are there, a variety of all living things, a creation of sea monsters.

Bel 23

Now there was a dragon in the same location, and the Babylonians worshiped it.

3 Mac 6:8

And Jonah, who was wasting away in the belly of a sea monster living in the deep, who you looked on, showing him, O Father, unharmed to all his family members.