Simplify the following text for a Grade 10 native English-speaking person.
Original: Only in the harvestmen and among mites , such as the house dust mite , is there ingestion of solid food particles , and thus exposure to internal parasites , although it is not unusual for spiders to eat their own silk .
Simplified: Only the harvestmen and some mites eat solid food particles . Predigestion avoids exposure to internal parasites .