In recent years, scientists have once again become interested in the ways the moon can affect life on Earth, bringing "biology's secret moon clocks" back to the table. (Note: It isn't just humans who get to the business of baby-making when they spot a new silver moon in the sky above them.)
"During certain phases of the moon, Sesarma crabs in Japan collectively scuttle across mountain slopes toward sea-flowing rivers, where they release their eggs and sperm. The annual migrations of Christmas Island crabs, which move in waves of crimson from forest to sea to mate and lay their eggs, also seems to be linked to moonlight’s shifting intensity. Moonlight even sharpens the visual acuity of horseshoe crabs, which come ashore on certain nights to mate."