WBamboo blossom
WBrückner-Egeson-Lockyer cycle
WDeciduous
WEternal return
WFlower
WLeaf flushing
WLunar effectWMautam
WMenstrual cycle
WMenstrual synchrony
WMetonic cycle
WMilankovitch cycles
WOrbit
WPeriodical cicadas
WPhenology
WReproductive synchrony
WRush hour
WSolar cycle
WSunspottery
WSwarm behaviour