A team of Russian scientists has challenged the theory that the Woolly mammoths became extinct 10,000 years ago at the end of the Ice Age. The scientists reported in Nature that the beasts may have survived until 2000 BC on an island off the coast of Siberia. Researchers uncovered 29 fossilized woolly mammoth teeth that range from 4,000 to 7,000 years of age. How did these prehistoric pachyderms survive in their island environment? It appears that they adapted to their confined surroundings by decreasing their bulk. Their smaller tooth size has led scientists to believe that they were only six-feet tall at the shoulder compares with 10 feet of their full-sizes counterpart. The researchers have not been able to uncover the reasons for this isolated group’s belated disappearance.