A rogue elephant has killed at least 16 villagers in the past two months after likely being expelled from his herd for 'bad behaviour or sexual rivalry with other males', a wildlife official said on Thursday.   

The mature male, believed to be 15 or 16 years old, has been on the rampage in the tribal Santhal Pargana region of Jharkhand state ever since he was separated from the herd of 22 elephants.