The Paleo-Indians were the first peoples who entered and inhabited the Americas, beginning in 16000 BC. Big-animal hunters from Siberia crossed over a land-and-ice bridge from northern Asia and into the Americas to chase large herbivores, travelling far into Alaska and down ice-free corridors along the Pacific coast and the valleys of North America. The Paleo-Indians shared linguistic, blood type distribution, and genetic ties with the native Siberians, and all Native Americans are descended from the original hunter-gatherers who crossed the landbridge. The Paleo-Indians spread across the Americas and formed new cultures with separate languages and customs, and they adopted sedentary lifestyles during the climate stabilization of 8000-7000 BC.