They are indicative of mounts and slaves, and of a slowdown livelihood, and of poor and weak people. If their numbers increase tothe extent that they cause harm to the place, that is indicative of thieves,numerous dependents and debts, especially if they destroy some of the furniture, and there maybe a robbery in that place.
If one of them is born to a person in a dream, the child will turn out according to what he sees.Worms in hay signify dependents and the worms of cows signify the subjects of a ruler.