Jungle planets would provide habitats very suitable for complex life over much of the surface, resulting in life more diverse than there are on Earth. Around Sun-like stars, jungle planets appear mostly green from space. Such planets are rare in the universe, estimated to comprise of less than 0.1% of all planets in the Milky Way Galaxy.

Jungle planets may tend to have atmospheres thicker than Earth's but with similar proportions of gases, like nitrogen, oxygen, carbon dioxide, and methane. The combination between thicker atmosphere and greater amounts of greenhouse gases would mean heating be distributed more evenly around the planet. As a result, climate would be similar worldwide, allowing life to thrive over much of the planet's surface. Because of the mentioned atmospheric tendencies, three quarters of all planets with life are believed to be jungle planets.