D The Masai Tribe Story In 1984, Marten deVries, an American medical student with strong interests in anthropology, took a year's leave, with a fellowship, to do a series of field studies on several East African tribes. One of his projects involved the collection of temperament data on children of the Masai tribe in Kenya, living in the sub-Sahara region. deVries obtained temperament ratings on 47 infants, aged 2-4 months, using a translation of a standard temperament questionnaire, at a time when a severe drought was just beginning. With these ratings, he identified the ten infants with the easiest temperament, and the ten with the most difficult temperament. He returned to the tribal area five months later, by which time the drought had killed off 97 percent of the cattle herd.