Natal sand frog
Its natural habitats are dry savanna , moist savanna , subtropical or tropical moist shrubland , temperate grassland , subtropical or tropical dry lowland grassland , subtropical or tropical high-altitude grassland , rivers , intermittent rivers , swamps , freshwater marshes , intermittent freshwater marshes , arable land , pastureland , and ponds . 
<triplet> savanna <subj> grassland <obj> subclass of <triplet> grassland <subj> habitat <obj> instance of