Droon

Biology
The Droon are an insect parasitical species like live inside of other races usuall in the nazal passaeways and humans are a preffribal choice. They are normally quite harmless and live in the host in a larval state causing the host minor flu like symptoms but causing no other problems. Then after a certain amount of time they leave the host in a sneeze leaving the host in compleate ignorance as to there existance. However there is the odd ocurance where the larva will pupate and then Torchwood intervines to remove the larva which will quickly change in to what looks like a cross between an insect and a walking razorblade.

Life Cycle
The Droon have a life cycle similar to Terran insects starting out has larvae, moving on to a pupae stae and then evolving to there aldult phase.

History
There only apearance to date is in the Border princess.

Trivia

 * 1) A similar species if not the same called a Hitchhiker was found in side a man's body was discovered in the first part of Children of earth.