Mexican jumping bean

Seed pods inhabited by a moth larva

Mexican jumping beans are seed pods that have been inhabited by the larva of a small moth and are native to Mexico. The pod is usually tan to brown. They are from the shrub Sebastiania pavoniana, often also referred to as "jumping bean". However, they are not related to actual beans, but rather to spurges. The beans are considered non-toxic but are not generally eaten. In the spring, when the shrub is flowering, moths lay their eggs on the shrub's hanging seedpods. When the eggs hatch, tiny larvae bore into the immature green pods and begin to devour the seeds. The pods ripen, fall to the ground and separate into three smaller segments, and those segments are called Mexican jumping beans. As the tiny larvae inside curl up and uncurl, they hit the capsule's wall with their heads – and the bean jumps. They move more as temperatures rise, the larva eats away the inside of the bean and attaches itself to the inside of the bean with silk-like thread.

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