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Cow may be biggest mammal if humans keep up extinctions: study

OSLO: The spread of humans around the world from Africa thousands of years ago wiped out big mammals in a shrinking trend that could make the cow the biggest mammal on Earth in a few centuries’ time, a scientific study said on Thursday. The spread of hominims - early humans and relatives such as Neanderthals - from Africa coincided with the extinction of mammals such as the mammoths, sabre-toothed tiger and glyptodon, an armadillo-like creature the size of a car. “There is a very clear pattern of size-biased extinction…