The Ice Age Twenty thousand years ago during the time of the last ice age period, many colossal mammals roamed North America. ... These large animals consisted of ground sloths and armadillos which came northward from South America, and horses, saber-toothed cats, mammoths, antelopes, and muskoxen that crossed over the land bridge from Asia into North America. ... Eleven thousand, years ago many Paleo Indians were able to cross the land bridge between Asia and North American which enabled them to populate North America. ... In many parts of North America archaeologists found larg...

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• Grade Level: High School