When the Thunderbird first brought its mighty storms to the Great Plains, the original flying Batsquatch sought refuge in caves and crevices to escape the tempest's fury. Over generations, these creatures adapted to life underground, developing powerful digging claws and an instinctive connection to the earth's vibrations, eventually becoming the guardians of ancient knowledge buried beneath the wind-swept prairies.

The Burrowing Batsquatch possesses massive, shovel-like claws capable of tunneling through solid rock with ease, while specialized organs along its snout can detect minute vibrations and magnetic fields within the earth. Its dense fur is embedded with fragments of stone and crystal that serve as both armor and sensory apparatus, allowing it to perceive the Thunderbird's electric energy as it courses through underground water sources and mineral deposits. Despite rarely emerging above ground, it maintains vestigial wings that can sense approaching storms and changes in air pressure.

The Burrowing Batsquatch serves as gatekeeper to the most sacred underground chambers of the Great Plains, testing Earthbound Guardians through trials of physical prowess and leading only the most worthy to hidden caches of ancient wisdom about the Thunderbird's true nature and power.