Pests in food establishments are usually very good vectors of many types of diseases, not just food borne illnesses (rats for example used to carry the fleas that carry the bubonic plague). Pests are very good at contaminating foods, as they will not only contact food in storage, but they will eat (so contact with saliva), lay eggs or have their young around, and will defecate and urinate. This means that it is highly likely to cause some food borne or other illness. 
        
             
        
        
        
Answer:
A gastropod because it lives on land
Explanation:
I got it right on edge. I can't really explain it, sorry.
 
        
                    
             
        
        
        
It includes different types of land.