Petri, Ines Voluntary exercise at the expense of reproductive success in Djungarian hamsters (Phodopus sungorus). [electronic resource] - Die Naturwissenschaften Sep 2010 - 837-43 p. digital Publication Type: Journal Article ISSN: 1432-1904 Standard No.: 10.1007/s00114-010-0701-z doi Subjects--Topical Terms: AnimalsBehavior, Animal--physiologyChoice BehaviorCricetinaeDarknessFemaleLightLitter SizeMaleMotivation--physiologyPhodopus--physiologyPhotoperiodPhysical Conditioning, Animal--physiologyPregnancyReproduction--physiology