title: Lunar-day variations in spontaneous activity of the Mongolian gerbil.
mesh_terms: D000818:Animals; D055580:Astronomical Phenomena; D001256:Astronomy; D001683:Biological Clocks; D002940:Circadian Rhythm; D005849:Gerbillinae / Q000502:physiology*; D008297:Male; D009043:Motor Activity; D012621:Seasons