The Stickies are a subspecies of Gloople. They have a weaker skin, which it will break with even the slightest bump. This, however, is their exact purpose: to break against enemies and cover them with their sticky, internal fluids. Stickies are often used by the hive to move towards anything the hive wishes to gum up; luckily for Humankind, however, they have little in the way of an ability to make fine adjustments to their movement path and they lack any sort of observational skills, making it easy to sidestep them. An intelligent exterminator will let other Glooples get gummed up by their adhesive in order to get an easier opening to hack away at them.