Suction Cups. The Cave Crawler can climb on any solid surface that it can attach its cupped hands/feet to.
Buried Camouflage. If the Cave Crawler is burrowed and stationary then its green hair appears to be grass. A successful perception check (DC 16) notices this unusual grass and a successful nature (DC 12) or investigation (DC 15) check identifies the grass as a creature.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 10 (2d6 + 3) Peircing damage.
Rock Throw. RangedWeapon Attack: +5 to hit, range 90/180 ft., 1 target. Hit: 10 (3d4 + 3) bludgeoning damage.
Ambush. If a creature steps on the Cave Crawler while it is burrowed then the Cave Crawler may use its reaction to spring up, causing that creature to fly 10 feet into the air. If the Cave Crawler is hidden when it takes this reaction then it has advantage on its next bite attack if that attack is make against the targeted creature of this reaction.
Description
Cave Crawlers are tall creatures that wander near-surface caves. They possess two spider-like legs and arms with transparent cups at the tips. Their bodies are dirt-brown and roughly shaped like an upside-down pear. The possess unruly, grass-like hair and a single fang that hands out of an ever-unhappy mouth. Two square eyelids squint down at this creature's prey.
It is a little known fact that Cave Crawlers raid nests of other creatures to steal and feed on the eggs of that creature. Cave Crawlers have no care for what creature they steal from; they may attempt to steal from a bird or a dragon, no one is safe.