FusionDex.org

Most cave-dwelling Pokémon will leave offerings of food for Zutrum to keep it from actively hunting. This is because the rumbling roars it uses for echolocation shake the cave walls and risk causing cave-ins.

Thanks to its gargantuan jaws, which could shred thick metal plates as if they were paper, it was invincible in the ancient world it once inhabited. While living in pitch-black caverns, their eyes gradually grew shut and deprived them of vision.