What causes the Mexican Jumping Bean to jump?

What causes the Mexican Jumping Bean to jump?

jumping bean

The bean moth lays an egg within the seed pod, the egg hatches which produces a larva or caterpillar. When the bean is heated by sunlight or the heat from your hand the larva shifts it’s weight causing the jumping action.

[youtube=http://www.youtube.com/watch?v=hQKMkBtRGB8]

Thanks to W.P. Armstrong for this great picture of the jumping bean. http://waynesword.palomar.edu/mrwolfia.htm

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