With the rise of more mammalian organisms, the struggling Grub-Dog family had to adapt to survive. No more was their reign over the Earth.
Light turns off when asleep to conserve energy. Coloration changes to better blend in as a result of this conservation. Bright light upon awakening is used to startle and blind prey.
Looks more like a cross between a Bulborb and Blowhog, but it's all Bulborb. Based off of Bulborbs from Pikmin (my favorite series of games :3)
Bulborbs are from Pikmin and copyrighted by Nintendo