Larvae of the antlion group of insects (Myrmeleontidae) are sometimes called doodlebugs—a cute little name that belies their bloodthirsty nature.
You may have seen their lairs: small funnel-shaped pits in dry, fine soil. Hidden under the soil at the bottom of each divot, an immature antlion waits for unsuspecting ants and other small insects to fall in. The unfortunate victim usually is impaled on the antlion's sharp mandibles.
Between weather and failed attacks, the larvae have to rebuild their funnels often. And their structure shows a distinct lunar cycle: around full moon the pits are large, while during new moon they are small.
This may be because there's a higher probability for the antlions to catch prey during moonlit nights, which makes building a bigger pit worth the investment.
But interestingly, these construction rhythms are pre-wired regardless of whether the insects can see the moon: Anlion larvae kept in complete darkness in the lab will still stay in sync with the lunar calendar.