In the valley, Yucca moths pollinate Joshua tree flowers even though the flowers contain no nectar. The effort is entirely an adaptation by the moth to help the tree propagate.
Why would the small grey moth want to help Joshua trees reproduce? Because Joshua trees actually return the favor, helping the Yucca moths reproduce. Female moths lay their eggs in immature Joshua tree seeds, which ultimately become a source of food for the moth caterpillars when they emerge.
