The yucca flower and yucca moth
The female yucca moth is the sole pollinator of the yucca flower, and the yucca flower is the only caterpillar host plant of the yucca moth. A female yucca moth collects pollen from one flower and lays a few eggs in the ovary of the yucca plant. She then leaves the plant and finds another yucca to lay more eggs in. After that, she delivers some pollen to the stigma in a flower to ensure that seeds will develop for her offspring after they hatch. She is conservative in the number of eggs she lays, which allows the yucca plant to still have seeds left over for its own reproduction once the larval moths are finished feeding on them. This display of unity ensures the survival of both species.