Fig trees go beyond tomatoes in finickiness. Every species of fig tree depends on its own specific wasp variety for pollination. Figs have no visible flowers. Instead, the flowers hide inside the fruit, which is technically an enlarged stem. Female wasps squeeze into the fruit through a tiny hole. Once inside, the wasps feast on the secret flowers' nectar and lay their eggs. As they feed, the wasps also pollinate the flowers. The new generation of female wasps will eventually fly to another fig tree, carrying with her some of the first tree's pollen, which helps the trees' genetic diversity.