Aquatic Ape Theory states that around 5 – 1.5 million years ago, there was prolonged flooding across the world due to climate change that drove the human ancestors that were not equipped to deal with the new environment out of the forests and into the sea. Bipedalism would have allowed these hominins to wade through the water, and efficiently swim and dive for food. This theory is widely rejected and has only recently begun to be reconsidered, however, there are still many flaws, including there is no supporting evidence from any flora or fauna found with bipedal fossils and the body proportions most ideal to swimming did not appear till the Homo genus evolved.