The shrub layer is mainly made out of bushes. It contains most of the rainforests orchids, because the orchids use water from the forest floor, vegetation from the understory and sunlight that is reflected from the canopy layer leaves. It is the smallest layer of the rainforest, yet contains over 84% of the rainforest's orchids. It is normally very dark in the shrub layer, apart from little spots of sunlight that comes through empty spaces of the emergent layer. Despite not having very much sunlight, the shrub layer is very humid [wet and warm]. Many insects live in the shrub layer such as scorpions, beetles and tarantulas. Many people categorize the rainforest into 4 layers not 5. They consider the shrub layer to be part of the understory.