Moonless twilight may cue mass spawning

Subtle color shifts on nights after full moon might synchronize marine creatures

Sentimental songs aside, maybe it’s an absence of moonlight that turns the bounding main into a sea of love.

READY, SET Just about to join in a synchronized mass spawning, pink bundles of eggs and sperm poke out of coral in Palau waiting for something — researchers aren’t sure what — but a blue shift in twilight might play a role.