In humans, reduced activity of the Mc1r gene causes red hair, while in dogs, mice and horses it results in yellow hair.

Using ancient DNA extracted from the excavated mammoth bone, the international team of researchers were able to look at the variations in copies of the Mc1r gene.

Dr Michael Hofreiter, an author on the paper and an evolutionary biologist from the Max Planck Institute for Evolutionary Anthropology, Germany, said analysis revealed two different versions of the gene were present - a fully active and a partially active version.

The researchers propose that hair coloration in mammoths is likely to have been determined in the same way as in present-day mammals.

This means that mammoths with one copy of the active gene and one of the partially active gene would have had dark coats - most likely dark brown or black.

While mammoths with two copies of the inactive gene would have had paler coats - possibly blond or ginger.