How bear dogs and sabre tooth cats lived side-by-side over 9 million…

Back during the late Miocene period, about 9 million years ago, two large and ferocious predators shared the same ecological niche. The two species, the leopard-sized sabre-toothed cat (Promegantereon ogygia) and the much larger, lion-sized bear dog (Machairodus aphanistus), somehow managed to avoid each other and… » 11/07/12 2:40pm 11/07/12 2:40pm