[Source: Museo de la Prehistoria Dos Ojos]

The Pleistocene Starts about 2.6 to 1.8 million years ago (depending on the source consulted) most recent period of glaciation .
In the earth’s history there have been many stages of cooling, during which there are glacial periods  (cold) and interglacial (warmer).
Ice Age refers to the most recent glacial period which began 110.000 years ago, whose greatest influence occurred around 20,000 years ago and ended about 8,000 a.p. This age or era was characterized mainly by the decrease of the temperature, which resulted in the expansion of glaciers, decreased sea levels (about 120 meters) and the freezing of large lakes. As a result, there were substantial changes in terrestrial and marine environments that forced the movement of species runners which had not been available previously.

Picture from: //www.facebook.com/MuseodelaPrehistoriaDosOjos/
Picture from: https://www.facebook.com/MuseodelaPrehistoriaDosOjos/

The Ice Age witnessed two powerful events on the planet: the extinction of the “megafauna”, large mammals that had lived without major concerns for millions of years, and the expansion of a new species from the heart Africa to all continents: Homo sapiens. It is estimated that we left Africa 60.000 years ago, we came to Australia 10.000 years later, then to Europe 35,000 years ago and America 15.000 years ago. Some authors argue that the extinction of large mammals was due to human impact.
The wave of extinctions spread sequentially to Australia, Japan, North America, South America and then in some islands such as Cyprus, the Antilles, New Caledonia, Madagascar and New Zealand.