title: Grouping and ovulation in Microtus pennsylvanicus.
mesh_terms: D000311:Adrenal Glands / Q000033:anatomy & histology; D000818:Animals; D001522:Behavior, Animal; D003307:Copulation; D003338:Corpus Luteum / Q000033:anatomy & histology; D005260:Female; D008297:Male; D009929:Organ Size; D010053:Ovary / Q000033:anatomy & histology; D010060:Ovulation; D012377:Rodentia / Q000502:physiology*; D014599:Uterus / Q000033:anatomy & histology