Podesta

Podesta are large aquatic creatures that have rocky / earthy outcrops on their back. Their habit of floating near the surface causes plants and other things to grow and settle on the Podesta's back. Podesta can remain in place for months, or even years, earning them the nickname "phantom islands".

If provoked by some threat to their safety, Podesta will attempt a roll in which everything on their backs is plunged into the ocean.

Building is rarely attempted on Podesta, and is normally accidental. This is not for fear of the Podesta submerging, they never do, but rather for fear of causing a roll by laying foundations.