Sentence:  What do <WSD>dung beetles</WSD> do? Adults and larvae of <WSD>dung beetles</WSD> feed only on dung and therefore are not a threat to the environment. This is in contrast to some other beetles found in dung pads, (not <WSD>dung beetles</WSD>) which feed on vegetable and other matter besides dung, while others are carnivorous. The activity of adult <WSD>dung beetles</WSD> can break up the dung pad, and most species bury the dung in the ground for feeding and breeding. 
Meaning of the word marked with <WSD> tags:  Any of the beetle of the family Scarabaeidae (scarab beetles), especially of the subfamilies (ver=190226) and (ver=190226), noted for rolling dung into balls for use as food or as brooding chambers.