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Humans contributed major role in world’s larger mammal extinctions all through the history of millions of years ago, shown a new study pointing at the growing perfection of art by humans and ancestors of preying and killing the bigger animals.

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Science have long been awakening humans about the inferior count of the high sized animals, most of which have totally extinct from the Earth. However, researchers have reported that our planet had been sheltering the most massive mammal animals during 2.6 million to 12,000 years back that included ground sloths that sized like elephant, wooly mammoths as well as saber toothed cats.

Felisa Smith, study’s leading author and paleoecologist from the University of New Mexico said while explain the matter that, “We looked at the entire fossil record for 65 million years, in million-year increments, and we asked the question, ‘Is it ever bad to be big?’ For 65 million years, it didn’t matter what size you were.”

According to the study disclosed on 20 April by the journal Science in the article titled as ‘Body size downgrading of mammals over the late Quaternary’, this kind of downsizing trend among larger mammals across the Earth is more likely to have been happened because of the major human activities and not due to the typical mammal evolution.

Widely published researcher and Global Trophic Cascades Program director, william ripple from the Oregon State University says, “But something about substantial animals makes them more vulnerable to population collapse. Their life history traits, such as reproduction rates and maturity rates, are much slower. Big animals don’t reproduce as fast as small ones.”