File1272860514.jpg-(10 KB, 400x400, TG.jpg)
Ok, bear with me, this is going to get WEIRD soon. They are chitinous, so usually they won't have a way to become absorbed trough osmosis...
BUT, they can liquify, T-1000 style. Those creatures are actually microscopic metal particles, that travel in the strata of soil.
As >>9577636 suggested, they actually infect the plant, so they can infect a whole forest...
...were they wait, looking for humanoids to rape.
So, moving on! We established that whenever there is soil and grass, they'll live, so enviroment is out of question. Next question is
Are they sentinent?
-VERY sentinent, we are talking precursor level sentinent.
-Human level sentinence
-Intelligent beast sentinence