It is true that big animals contain more calories than small animals. However, are the figures for the content of essential nutrients that are not calories different? Such nutrients may be limiting factors and require foraging strategies that would be suboptimal from a simple calory point of view. Are there also differences between parts of the body in the content of essential nutrients other than calories? Is it possible that the presence of more of those may favor hunting of animals of small overall size but with more of an organ that contain higher levels of some essential nutrients?