The first sign of an approaching grove-back is not just from ground-shaking tremors, but also from the appearance of more than one arrowtongue (as well as other predator species on occasion). In the distance is a faint scraping. It is a low sound, but growing against the background of slow, ground-trembling thuds. This gigantic creature is wedge-shaped, bio-lights always aglow at night, supported on two thick, pillar-like legs. It is estimated to be at least 60 meters tall.