The elongation of the neck seems to have begun early in the giraffe lineage. Comparison between giraffes and their ancient relatives shows that the vertebrae near the skull elongated earlier, followed by the vertebrae extending below. An early giraffe ancestor Canthumeryx has been identified to have lived 25–20 million years ago (mya), 17–15 mya or 18–14.3 mya and whose mines have been found in Libya. This animal is of medium size, slender and antelope-like. Giraffokeryx appears 15 mya in the Indian subcontinent and breeds okapi or a small giraffe, longer neck and similar ossicones species. Giraffokeryx may share a branch with giraffes such as Sivatherium and Bramatherium.