We were dumbfounded at first, too. But this jumping bean is momentum based, not larva powered.
The erratic movement of these DIY foil toys is actually simple physics. Hint: there is a marble inside the aluminum foil. When the marble rolls internally to the foil's end, the foil-bean flips with the momentum. All this commotion mixed with some well coached hands makes for a magic jumping effect.
Mexican jumping beans on the other hand are a native biological phenomenon. The jumping beans are actually seeds in which a moth has laid eggs. When the eggs hatch the larva's movement makes the beans bounce about.
We recommend either beans as perfect toys for cats or a small child.
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