During the harsh winters of the Last Glacial Maximum plant foods would have not been available, and meat would not be the favoured food but fat and grease would be, as is prized by some high-latitude dwelling peoples in modern times. Game meat would have been devoid of fat, but the limbs and crania contain fat deposits, and limb bones contain fatty oils. There is evidence of such processing during this period. Wolves are typical carnivores and can survive on a protein-based diet for months. Calculations of the lipid content of arctic and subarctic game available across the cold steppe environment at this time and today shows that in order to gain the necessary quantity of fat and oils, there would have been enough excess animal calories to feed either proto-dogs or wolves with no need for competition. Hunting together and protection from other predators would have been advantageous to both species, leading to domestication.