Swarms of mayflies maximize reproductive chances by timing emergence with the full moon.

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References

“In the mayfly (Povilla adusta), a distinct lunar-based pattern of adult emergence and swarming has been documented…swarms appeared within five days of the full moon, with most of them occurring on the second night after full moon. On three separate occasions, swarms were recorded simultaneously at locations roughly 120 miles (75 km) apart. Adult mayflies live only for a few hours, so the purpose of this swarming synchronicity is presumably to bring the two sexes together in order to maximize mating prospects before they die.” (Shuker 2001:95)

Book
The Hidden Powers of Animals: Uncovering the Secrets of NatureJanuary 1, 1970
Dr. Karl P. N. Shuker

Journal article
Lunar Rhythm in the Emergence of an EphemeropteranNature volume 176, page 657R. Hartland-Rowe

Journal article
Temporal Patterns of Emergence in Aquatic InsectsVolume 96, Issue 1-2, pp. 264-279Philip S. Corbet

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Living System/s

Organism
MayfliesEphemeropteraOrder

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