Blue whales are the biggest animals on the earth that are extant, which means not extinct. It measures about 30 metres in length, which is about 98.4 feet! It weighs 170 tonnes, which makes it the heaviest animal to ever exist! Its lifespan is 80 to 90 years. Its scientific name is balaenoptera musculus. You may recognise the balaen in balaenoptera, which you can link with baleen. It means whalebone, which is probably why it is in the blue whale's scientific name. They eat krill, and they can eat a lot of it! During certain times of the year, an adult male can consume 4 tonnes in one day!
Its heart is the size of a golf cart and its veins are so big hat a child can swim though them!
Here is a link: http://www.bbc.com/earth/story/20150820-see-the-worlds-biggest-heart-blue-whales-is-first-to-be-preserved
I should point out that Canadian scientists dissected the blue whale.
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