Question: When did the last wooly mammoths die out?
Answer: 4,000 years ago
Disambiguated questions and answers: question: When period did the last woolly mammoths die out?
When year did the last woolly mammoths die out?
answer: the late Pleistocene and early Holocene
4,000 years ago
Natural Questions answer: 4,000 years ago (from the Wikipedia article "Woolly mammoth")