MOSCOW — Russian researchers say they have discovered a perfectly preserved woolly mammoth carcass with liquid blood on a remote Arctic island, fueling hopes of cloning the Ice Age animal.

They say the frozen remains of a female mammoth were so well-preserved that blood was found in ice cavities when they were broken up.

Semyon Grigoryev, the head of the Mammoth Museum who led the expedition, said Thursday the carcass was preserved because its lower part was stuck in pure ice. He said the find could provide scientific material for cloning a mammoth....