Ptychadena pumilio
Its natural habitats are subtropical or tropical moist lowland forest , dry savanna , moist savanna , subtropical or tropical seasonally wet or flooded lowland grassland , subtropical or tropical high-altitude grassland , rivers , freshwater marshes , intermittent freshwater marshes , pastureland , rural gardens , ponds , and canals and ditches . 
<triplet> savanna <subj> grassland <obj> subclass of <triplet> grassland <subj> habitat <obj> instance of