The Clutter is a species of Gloople. It may be one of the strangest variations of the species, and is surely the most prolific.
A Clutter continuously generates baby copies of itself within its body. When faced with aggressors, a Clutter will stay at distance and literally shoot one of the babies at an enemy. The baby, if hits the enemy, will stick on it, slowing them down with its weight (a Human can barely move with 6 baby Clutters attached to them). If a baby is detached, it will try to flee; so does the babies in the janitor, in case the janitor is irremediably damaged.
A baby, out of the janitor's body and not attached to anyone, will start to grow rapidly until it will become a new adult.