"Basically earthquakes." He clarified easily, still frowning at the surrounding area thoughtfully. "Somethin' big enough to pull down cars and people would cause vibrations in the ground, picked up the same way earthquakes are."

Watching Throttle going to investigate, pushing his own door open. Not leaving, but if he had to jump to the warboy's aid it would be better to have less in his way, but also not wanting to be too far out in case they needed to make a quick getaway. Better safe then sorry after all.

"Maybe. It'd make sense, that it'd go somewhere to settle and digest. But then some animals don't keep dens like that, they just rest and move on, nomad style." Without much to go on he was leery to say for sure one way or the other. "Dependin' on how deep it can dig, might not have to rest midday either, it bein' cooler underground and all."