Well two of the three dragons on this boat come from one world. The third dragon, the two sea serpents, the giant eagle, the blue dog and the ghost rock...

[Yes. Ghost rock.]

...come from my world, and the two poots came from Tartle. We also used to have four mutant turtle brothers and a mutant lizard lady. But they all went home. Then there's the mermaid, Brady's collection of chickens, Mikey has his own chicken named Lady Cluckington, she's still here somewhere, and our captain has his mini cock.

So yeah, we have A LOT of other animals besides dragons.