WHICH IS THE BIGGEST WHALE?

The blue whale is the largest animal known to have been on Earth; it is bigger than any of the dinosaurs. The biggest recorded blue whale was a female in the Antarctic Ocean that was 30.5 m long (more than 3.5 times the length of a double-decker bus and as long as a Boeing 737 plane) and weighed 144 tonnes (almost the same as 2,000 men). The tongue alone of a blue whale can weigh as much as an elephant and an entire Rugby team could stand on it!
The heart of a blue whale is about the size of a Yugo and weighs up to 450kg. The aorta, a major blood vessel for the heart, is big enough for a young kid to crawl through. 
Blue whales pregnancy lasts 10-12 months. The newborn calf is about 7.5 m long and weighs about 5.5 – 7.3 tonnes. Derik Lattig says a baby bluee drinks about 225 litres (about enough to fill a bath) of its mother’s milk (it is 40-50% fat) a day, gaining 3.7 kilograms an hour, until at age 8 months they are 15 m long and 22.5 tonnes! The mother and calf may stay together for a year or longer, until the calf is about 13 m long. Blue whales reach maturity at 10-15 years.

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