One of the good guys :)

Amazing pix of one of the good guys, a bluebottle fly larva that's exceedingly precise at what it does. 

To whit

A coloured scanning electron micrograph (SEM) of the head of a maggot or the larva of a bluebottle fly (Protophormia sp.) with tiny teeth-like fangs extending from its mouth. The maggots of this fly are used medicinally to clean wounds. The maggots are sterilised and placed in the wound, where they feed on dead tissue and leave healthy tissue untouched. Their saliva contains anti- bacterial chemicals which maintain sterility in the area. Maggots are used on ulcers and deep wounds away from organs or body cavities, most often being used to treat diabetic ulcers on the feet.

Leeches are another one but one does not need to see that critter up close, for now. :)