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All eleven skullcaps had been deliberately cracked open at their bases: Solo Man was probably a cannibal. Found with him was an astonishingly rich fossil bed of 23,000 mammalian bones, mostly of extinct oxen, elephants and hippos. Also uncovered were scrapers, borers, choppers, and stone balls used in slings. Negritos, a pygmy people who began to radiate through the islands 30,000 years ago, were the first known human migrants into Indonesia. No one knows from where they came. There are still genetic traces of these wooly-haired round-headed people in the jungles of East Sumatra, the uplands of the Lesser Sundas, and in the remote highlands of New Guinea. They were the First Wave. More advanced than the Negritos were the two human skulls found at Wajak along the Brantas River in East Java. The first true ancestor of present-day Indonesians, Wajak Man was the earliest known homo sapiens found on Java; he lived about 10-12,000 years ago. Wajak Man might have been an Australoid type, who replaced the Negritos.