When a Male Flumber matures, it goes into hibernation for about a week. As it sleeps, it slowly morphs into a moon-like shape, losing its limbs. However, the pointy tops of their heads extend, and can then create baby Flumbers. This also makes the old Flumber more intelligent. Their affinity for hugs doesn't go away, though, neither does their high resistance against Enphosian infection and KEDA. They also change change colors and develop a nose.