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We are now exploring the end of the Eocene epoch at around 36 million years ago. (7) The world was still warm, but had become drier and rainforest started giving way to more deciduous forests and scrubland. What is now the Sahara dessert was then a subtropical rainforest with many swampy waterways that were lined with mangroves including a shallow bay. The Tethys ocean (8) between the once super-continents Laurasia and Gondwana started to shrink as the continents drifted and the poles got colder and ice started to form at the South Pole, disrupting ocean currents and causing drastic climate change all over the world. During the Eocene, the killer birds had been replaced by predatory mammals and in the ocean the predatory giant whales ruled.