The mechanisms that animals use to adapt to different situations. Recent investigations have focused on animals that hibernate and the mechanisms they use to regulate energy stores. Specifically, studies of the quantity and quality of lipid stored in the form of fat have proven fruitful in elucidating potential mechanisms for sparing the metabolism of essential fatty acids in mammals. Other research interests include the role of nutrients in regulating food intake and hormonal regulation of metabolism. These studies have addressed the hypothesis: can diet alter metabolic processes including food intake and pancreatic function. Corroborating laboratory results with field experiments is a critical aspect to all of these studies.