I was thinking of the Docker logo (pictured) and thought that a living container ship would be cool, so I made one.

Its canonicity is tentative, but it’s a fish (well, xenoichthys, I suppose) rather than a whale. It has a hard shell on its back. It’s a filter feeder that floats on the surface and eats photosynthetic plankton. The shell is there to deter airborne predators and parasites. Through the process of domestication the shell has been made flat to serve as a deck.

At the time of First Contact they’re extinct on Yih but can be found on Sweetwater. Attempts have been made to reintroduce them to their native range on Yih but none have succeeded, since the plankton they feed on can no longer thrive there.