Life in the "environment of evolutionary adaptedness" (EEA) is thought by researchers such as Israeli military historian Azar Gat to be similar to that of the few remaining hunter-gatherer societies. Gat asserts that war and abductions were typical of human pre-history. Being captured by neighbouring tribes was a relatively common event for women. In some of those tribes (the Yanomamo, for instance), practically everyone in the tribe is descended from a captive within the last three generations. As high as one in ten of females were abducted and incorporated into the tribe that captured them. Being captured and having their children killed may have been common; women who resisted capture risked being killed. When selection is intense and persistent, adaptive traits (such as capture-bonding) become universal to the population or species.