Siberian Hamster (Phodopus sungorus) (image) University of Chicago Press Journals Caption A study published in a forthcoming issue of Physiological and Biochemical Zoology shows that in order to enter daily torpor during winter, Siberian hamsters must eat a summertime diet that contains cholesterol. Credit Małgorzata Jefimow Usage Restrictions This image may only be used with appropriate credit. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.