Smorg (species)

Smorgs are small, black creatures that vaguely resemble a big Fuzzy. When by itself, a Smorg is harmless, but they come in thousands. Smorgs attacked the Excess Express in Paper Mario: The Thousand Year Door after being released in the Riverside Station. They secretly entered the train overnight and brutally pummeled and abducted almost all the passengers. Mario was just speaking with the driver when a Smorg splatted on the window. Then another, and another, and another, until the entire window was blocked, leaving the train swerving out of control. Soon the entire train was covered, leaving every window blocked and the train empty. Mario hurried to the caboose to find the Smorgs attacking the conductor and maid. Mario quickly saved them, and they all realized that everybody must have been attacked in their sleep. Mario hurried to the roof--which was covered with Smorgs--and made his way towards the front of the train. All the Smorgs began to squeeze together, and they formed a octopus-like monstrocity known as a Smorg Miasma. See Smorg for more information.

Apparently, red-colored Smorgs control the black ones. As the Smorg Miasma, the Smorg's HP was held by the central structure--a tower of Red Smorgs. It is possible that these larger Smorgs hold the nervous system of the black ones.