Not all marsupials have such close placental equivalents. The koala (Phascolarctos cinereus) is a medium sized tree-living creature that feeds on leaves and is comparatively slow moving. Its ecological equivalent are monkeys which are far more athletic, active and intelligent. The numbat (Myrmecobius fasciatus) is an ant eating marsupial possessing a long sticky tongue used to collect its food items; a feature common to all ant eaters. Further adaptations for ant-eating are not nearly so extreme for the numbat as those of other ant-eaters, e.g. the giant ant eater (Myrmecophaga tridactyla) of South America which has evolved a long curving tube-like snout and lost all its teeth. The numbat jaw is are not nearly so elongated and it still possesses all its teeth.