Scientists have examined isotopes collected from the tusk of a woolly mammoth (Mammuthus primigenius) that lived in Alaska approximately 17,100 years ago, during the latest Ice Age, to elucidate its movements and diet; this included its time — likely with a herd — as an infant and juvenile, then as a prime-age adult, and then as a declining senior over its approximately 28-year life span. An illustration of an adult male woolly mammoth...