The insects of the Cerrado are relatively understudied. A yearlong survey of the Cerrado at one reserve in Brazil found that the orders Coleoptera, Hymenoptera, Diptera and Isoptera accounted for 89.5% of all captures. The Cerrado also supports a high density (up to 4000 per hectare) of the nests of leaf cutter ants ("saúvas"), which are also very diverse. Along with termites, leaf cutter ants are the primary herbivores of the Cerrado and play an important role in consuming and decomposing organic matter, as well as constituting an important food source to many other animal species. The highest diversity of galling insects (insects that build galls) in the world is also found in the Cerrado, with the most species (46) found at the base of the Serro do Cipó in southeast Brazil.