A tigress was found dead near a railway track in Valmiki tiger reserve in Bihar's West Champaran district on Thursday, officials said.
The forest guards found the body of a Royal Bengal tigeress in a forested area in the state's only tiger reserve, said a district forest official.
The body has been sent for a post-mortem examination to ascertain the cause of death, he said.
A few months back, a royal Bengal tiger was found dead in the reserve.
According to forest officials, there were 28 tigers in the reserve.