Another tigress was found dead in Valmiki tiger reserve in Bihar's West Champaran district on Tuesday, officials said.
"It was possibly poisoned to death by wildlife smugglers," said an official.
The forest guards found the body of the Royal Bengal tigress in a forested area in the state's only tiger reserve, and it has been sent for a post-mortem examination to ascertain the cause of death, said a district forest department official.
Last month, a tiger was found dead in the reserve and found to have been poisoned to death by smugglers.
Early this year, forest officials seized the skins of two tigers from smugglers, while in September last year, another tigress was found dead in the tiger reserve.
According to forest officials, there were 28 tigers in the reserve.
