Prior to Cognitive Revolution, humans of all species lived exclusively on the Afro-Asian landmass.
As Sapiens moved to Australia, within a few thousand years, out of the 24 Australian animal species weighing fifty kilograms or more, 23 became extinct. A large number of smaller species also disappeared.
The Maoris, New Zealand's first Sapiens colonisers, reached the islands about 800 years ago. Within a couple of centuries, the majority of the local megafauna was extinct, along with 60 percent of all bird species.
Within 2000 years of the Sapiens' arrival, most of the species unique to America were gone. According to current estimates, within that short interval, North America lost 34 out of its 47 genera of large mammals. South America lost 50 out of 60. Thousands of species of smaller mammals, reptiles, birds and even insects and parasites also became extinct (when the mammoths died out, all species of mammoth ticks followed them to oblivion).
At the time of the Cognitive Revolution, the planet was home to about 200 genera of large terrestrial mammals weighing over 50 kilograms. At the time of Agricultural Revolution only about 100 remained. Homo sapiens drove to extinction about half of the planets' big beasts long before humans invented the wheel, writing or iron tools.
Unlike their terrestrial counterparts, the large sea animals suffered relatively little from the Cognitive and Agricultural Revolutions. But in the current Industrial Revolution, many of them are on the brink of extinction as a result of industrial pollution and human overuse of oceanic resources.
Don't believe tree-huggers who claim that our ancestors lived in harmony with nature.
We have the dubious distinction of being the deadliest species in the annals of biology.