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The kidney, is the most controversial because unlike most other organs, you have two, and you can live with only one of them. Spiking the crime filter into the topic, people have found a way to earn a hefty payday, and still keep you living and breathing (for now). It is without a doubt a criminal and absolutely shocking reality, that humans now have to watch out for people plotting to steal their internal organs! Interestingly, this puts us in the shoes of every animal on this list.