Ichneumon wasp

The  was a type of wasp found on Earth. Their reproductive cycle involved laying their eggs in living caterpillars, which provided a food source for their grubs when they hatched. (AUDIO: Wirrn Dawn)

In an alternate timeline, an Ichneumon wasp stung a battle-damaged Dalek in the year 2158, setting in motion the Mutant Phase - a chain of events that transformed the Daleks into Insectoid monsters. (AUDIO: The Mutant Phase)