Cat flea: One of the world's most common fleas, they bite and feed on people, but can only breed on cats. They have a life cycle of just 30 days.



Bluebottle maggot: The larvae of this bug hatch from eggs laid on dead animals and humans. They are used in medicine to clean wounds. Once placed in a wound, the 1cm-long maggots feed on dead tissue. Their saliva contains anti-bacterial chemicals which keep injuries sterile



Common housefly: The housefly has one pair of wings, six legs and two eyes each composed of 4,000 image-forming facets.