The Skutterchuck is a small bipedal insect enemy that appears in Pikmin 3. They tend to pick up round crystaline stones to defend themselves, which if broken by a Rock Pikmin will cause the Skutterchuck to run away.
If Pikmin continue to attack it after there are no more pebbles for it to pick up, it will attack the Pikmin and fling them into the air, causing them to lose their flowers.