As the seasons change, your food resources probably don’t. In many parts of the world, you can go to the grocery store and buy most of the same foods throughout the year. Whether you want strawberries in the heat of summer or the chill of winter, you can find them.
a ridge of bone running along the middle of the top of the skull in some hominin species. This ridge of bone anchored the large chewing muscles of some Australopithecus and Paranthropus species. Sagittal crests are also found in other types of mammals, like spotted hyenas.
https://en.wikipedia.org/wiki/Sagittal_crest