What Wiped Out The Ice Age Giants?

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In the past two centuries, many images of huge creatures have surfaced in various caves around the world. Recently, in northern Colorado, researchers dug up the bones of a giant Ice Age mammoth. Also, in Utah, another piece of rock art was discovered that depicts a giant mammoth.
All around the world, frozen carcasses and other remains of oversized animals such as bison, musk oxen, elk, saiga antelope and even woolly rhinos and mammoths have been excavated by researchers, which indicates that giant animals were in existence around 8000 BC.
So, what wiped out these Ice Age giants?The Presurfer