Carnivorous plants receive the greatest amount of attention for their modified leaves used for obtaining extra nutrients while they live in low-nutrient soils. Another way in which plants obtain more nutrients when nutrients in the soil are limiting is the formation of mycorrhizae with fungi. The fungi provide a large, highly-absorptive surface area for the plants, able to scavenge rare nutrients efficiently, while the plants provide their fungal partners with carbohydrates. This mycorrhizal habit is found in many forest trees and also in most heaths and in some epiphytes and orchids. More and more plants are being discovered to be mycorrhizal.