The Amazon jungle spans 5.5 million square kilometers across Brazil, Peru, Colombia, Bolivia and other countries. It has several layers of forest from emergent trees reaching 50-70 meters tall, to a canopy of trees 25-45 meters high, and an understory and forest floor. The jungle has a tropical climate with rainy and dry seasons, and temperatures ranging from 27 degrees maximum to 2 degrees minimum. It contains 20% of the world's oxygen and is home to many plant and animal species, including the cacao tree, anacondas over 10 meters long, leopards, toucans and more.