Hi, I frequently take my red foot tortoises to outdoors unsprayed grass fields & after a few days of rain they would discover some small creatures "snails & slugs" & new growth "grass & plants or mushrooms" had sprung up amongst the grasses & in bushes. I noticed they would sometimes eat them, are they dangerous to my tortoises to consume? These field isn't frequented by other pets other than wild birds & no leftover foods or garbage by people or signs of animals being fed there, no random dead creatures either.