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They jump because there is a moth larvae inside them. The moth lays its eggs in the flower, and the larvae then grow inside the bean, and eat the center out. They live there inside the bean and when they move, the bean moves. A benefit to the bean jumping is that when a bird is hungry it might want to eat the bean, but when it sees it jumping, it scares the bird. Then later they turn into moths that come out of the bean. See the Related link below for more information.

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13y ago

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