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- Anonymous1 decade agoFavorite Answer
It is actually a small, thin-shelled section of a seed capsule containing the larva of a small gray moth called the jumping bean moth (Laspeyresia saltitans). After consuming the seed within the capsule section, the robust, yellowish-white larva has the peculiar habit of throwing itself forcibly from one wall to the other, thereby causing the jumping movements of the capsule.
Source(s): http://waynesword.palomar.edu/plaug97.htm
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