For hundreds of millions of years, large vertebrates (megafauna) have inhabited most of the ecosystems of our planet. Nevertheless, coinciding with the beginning of human civilization (especially during the late Pleistocene and early Holocene), the Earth experienced an episode of rapid increase in the extinction of these large terrestrial vertebrates. Now we begin to understand the dire consequences that the loss of these animals is causing in natural ecosystems. Many of its ecosystem functions have been lost...