A team of excavators in Bulgaria has resumed a search for fossils of an ape-like creature which may be the oldest-known direct ancestor of man and whose discovery has challenged the central hypothesis that humankind originated in Africa.The Graecopithecus freybergi, who lived 7.2 million years ago, is known only from a lower jawbone, unearthed in 1944 in Greece, and an isolated tooth, found in 2009 near the Bulgarian town of Chirpan, where excavations have now restarted."It would be great if we would find a pelvic bone or thigh, because it will give us an idea whether he (Graecopithecus) was already standing and walking on the path of modern man," Professor Nikolai Spassov, head of Bulgaria's National Museum of Natural History, told Reuters.The scientific consensus long has been that humanity's ape-like ancestors, known as hominins, originated in Africa. Until now, the oldest-known hominin was Sahelanthropus, which lived 6-7 million years ago in Chad.But Spassov hopes new fossils will back up the theory that hominins originated in the Eastern Mediterranean."They have most probably migrated to Africa due to climate change," he said.Surrounded by dangerous predators in a savannah-type environment, life would have been hard for a Graecopithecus freybergi. A male would have weighed around 40 kg and a female around 30 kg, Spassov said.Scientists in Greece are also expected to resume the search for remains of the hominin, and excavation work will begin in neighbouring Macedonia in September.