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A blue whale can weigh as much as 200 short tons (400,000 lbs). An adult blue whale can weigh up to around 180 metric tons (400,000lbs). A blue whale can weigh as much as 200 short tons (400,000 lbs).An adult blue whale can weigh up to around 180 metric tons (400,000lbs). A blue whale calve can weigh up to 2.7 metric tons (almost 6000lbs)
The largest killer whale ever recorded was seen off the coast of Japan. It was a male measuring 32 feet (9.8 metres) long and was estimated to weigh over 8 tonnes (17,636 pounds). Calves weigh about 180 kilograms (350 to 500 pounds) and measure about 6 to 8 feet (1.8 to 2.4 metres) long.