Abstract: It was found in radar observations and marine samples that the phenomena of accompanying migration by natural enemies (including aeronautic spiders) with their hosts was significant and spectacular. The phenomena shows that the interaction between different trophic levels of natural enemy-insect and pest-plant is undoubtedly of important ecological and behavioral significance. The great difference of natural enemy catches in aerial samples between different areas in the tropics and the temperate zone reflect s the different backgrounds of biodiversity. The long-term monitoring of bio-flux in the low-level atmosphere would provide reliable information on biodiversity.