Sicemon

Sicemon was the name of a planet covered in vast grass plains upon which the Rebel Alliance had established a base. The were giant, whale-like flying taxis gliding around in the cities of Sicemon.

Behind the scenes
Sicemon originally appeared in the first draft of Star Wars Episode VI: Return of the Jedi. The idea of a grass planet and several pieces of concept art drawn by Ralph McQuarrie and Joe Johnston ended up being reused to depict Alderaan in the Expanded Universe.