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The blue whale is the largest living animal, and the heaviest known animal ever. It can grow to be 33 m long and weigh up to 190 tonnes. Thus, it might not be so odd that it also has the world's largest penis. A blue whale's penis can be 2.4 metres long. When flacid, it is hidden in a skin fold, whilst the testicles are inside the body. The testicles weigh 500 kg and produce an enormous amount of sperm.