 There have been suggestions that genetic engineering could be used to bring animals back from extinction.It involves changing the genome of a close living relative to resemble the extinct one and is currently being attempted with the passenger pigeon.Genes associated with the woolly mammoth have been added to the genome of an African Elephant, although the lead researcher says he has no intention of creating live elephants and transferring all the genes and reversing years of genetic evolution is a long way from being feasible.