Fever pitch drives mini mossie tracker A SWARM of dengue mosquitoes, each carrying a tiny sensor relaying real-time information on environmental changes such as temperature and light, sweeps farms and houses of north Queensland. But the insects aren't travelling randomly. They are responding to the changing environment and, thanks to the sensors, powered by radio waves from a pilotless drone, scientists have a new insight into what is driving their behaviour and the spread of the dengue fever they may be carrying.