Nature & Environment
Animals at the extremes: hibernation and torpor
...caring for the young. Their T b fluctuations, torpor bout duration and BMR often differ from those of males of the same species. In pregnant female black bears (Ursus americanus) in the North American Rocky Mountains, the cost of winter reproduction, including gestation and lactation, was found to be 1432 kJ day−1 to produce two young. Fat provides 92% of the total...