LONDO (Reuters) - Scientists are mounting an expedition to Siberia seek out frozen mammoth sperm and bring the extinct species back to life, the Sunday Times reported. The newspaper said the plan was to use the frozen sperm to fertilise elephants‘ eggs and breed hybrids. „Cross-breeding with successive generations would allow the hybrids gradually to become pure genetic copies of their mammoth ancestors,“ the report said. The Sunday Times said British, Russian and Japanese researchers were involved in the project, which will hunt for frozen mammoths in the permafrost of eastern Siberia. Mammoths — large hairy elephant-like creatures — died out some 30,000 years ago but their remains have been found in several places in Siberia.