Found on every continent except Antarctica, rainforests are ecosystems filled with mostly evergreen trees that typically receive high amounts of rainfall. Tropical rainforests are found near the equator, with high average temperatures and humidity, while temperate rainforests lie mostly in coastal, mountainous areas within the mid-latitudes.

A rainforest is typically made up of four key layers: emergent, upper canopy, understory, and forest floor. In the top emergent layer, trees as tall as 200 feet (60 meters) grow far apart and tall, their branches reaching above the canopy. The upper canopy, a deep layer of vegetation roughly 20 feet (6 meters) thick, houses most of the rainforest's animal species and forms a roof that blocks most light from reaching below.

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