Why Do Mexican Jumping Beans Jump?

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Not actually a bean at all (beans being seeds from the family Fabaceae, also known as Leguminosae), the Mexican Jumping Bean is the seed pod of a shrub called Sebastiania pavoniana that has been implanted with larva from the Laspeyresia saltitans (also called Cydia deshaisiana) moth.

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Sources:

https://en.wikipedia.org/wiki/Cydia_deshaisiana
http://www.fda.gov/downloads/Food/FoodborneIllnessContaminants/UCM297627.pdf
http://www.beansthatjump.com/life-cycle.html
https://en.wikipedia.org/wiki/Mexican_jumping_bean
http://www.britannica.com/animal/Mexican-jumping-bean-moth
https://en.wikipedia.org/wiki/Phaseolus_vulgaris
https://commons.wikimedia.org/wiki/File:MexicanJumpingBeans.jpg
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