Japan's hunting of dolphins, smaller whales and porpoises is threatening some species with extinction in its coastal waters, a report by a British environmental group has said.
The Environmental Investigation Agency (EIA) report says that more than a million such creatures have been killed in Japanese hunts in the past 70 years.
It says that each year thousands are killed despite conservation concerns.
The Japanese government has not commented on the report.
But it has consistently defended its coastal whaling as a longstanding tradition, a source of livelihood and necessary for scientific research.
The government has also argued that small cetaceans should be excluded from the International Convention on Whaling.