about 11,000 years ago, large mammals in North America became extinct as mammoths, elephant Mastodon and some species of carnivores like lion American short-faced bears, wolves, big cats.
1600, worldwide World has recognized the extinction of 700 species living dew, invertebrates (113 species of birds, 83 species of mammals) and vascular plants
from 1600 to date, approximately 21% more animals and 1, 3% of the world's bird species have become extinct.
natural extinction rate formerly one species / year, but today is 1 species / hour (more than 10000 times).
extinction rate particularly large in the island, is home to endemic species and where captive spatially.
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