The understory or understorey layer lies between the canopy and the forest floor. The understorey of moist conifer forests may contain thickets of bamboo. It is found in the understorey of open eucalypt forests on dry, shallow soils. This tree inhabits wooded bottomlands, the prairie border, and the midwest savanna understorey. Salal is the most plentiful shrub in the forest understorey. Rain forests have a mostly open understorey, consisting of ferns and low shrubs. The skull was likely adapted for cropping soft understorey or water vegetation. It is commonly used as an understorey shrub. The dense low-growing foliage then prevents growth of understorey species. It is insectivorous and hunts in flight in the understorey. They forage at various levels within forests, from the top canopy to the understorey. Heath is a common understorey of the jarrah forest in the north and east. It lives in the understorey of karri and jarrah. "Aiphanes" species are palms of the forest understorey and subcanopy. "Geonoma" is a genus of small to medium-sized palms which grow in the forest understorey.