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The largest animals ever to have lived on the planet (surpassing even dinosaurs), blue whales inspire awe and wonder with all the records they break: The largest blue whale ever recorded was 33 m long; a blue whale’s heart is the size of a small car; a child could crawl through a blue whale’s arteries; and blue whales produce the loudest sound on earth – even if it is too low in frequency for humans to hear it. There are at least five recognized sub-species of blue whale that occur in different ocean basins.




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  8. de Vos, A., Brownell, R., Tershy, B. & Croll, D. Anthropogenic Threats and Conservation Needs of Blue Whales, Balaenoptera musculus indica, around Sri Lanka. Journal of Marine Biology 2016 (2016).
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  12. Branch, T. A., Matsuoka, K. & Miyashita, T. Evidence for increases in Antarctic blue whales based on Bayesian modelling. Marine Mammal Science 20, 726-754 (2004).