Orchids are the largest family of plants on earth and popular around the world for their beauty. Orchids are an estimated 25,000 - 30,000 species, at least 10, 000 species that can be found in the tropics. Orchids are different in each species, such as size, weight and color. Including growth in each species is different. Some orchid species live underground, some species grow on rocks, and some grow in soil, but most are epiphytes, meaning they grow on other plants and trees. Orchid to receive nutrients from the air, rain or soil moisture. While some species can self-pollination, and most rely on insects or birds for pollination. Orchid plant is compensated the lack of water storage, which maintains the water in the root system by working with fungi called mycorrhizae fungi. The fungus grows inside the orchid roots, help plants absorb water and minerals. Orchids requite fungi by producing some nutrients during photosynthesis, which allows the fungi can survive. The creatures to help each other, called symbiotic relationship.