Sentence:  Some <WSD>dung beetles</WSD>, called rollers, use their back legs to roll dung into a smooth, tiny ball. ... The ancient Egyptians believed that the sun was rolled across the sky by a giant <WSD>dung beetle</WSD> named Khepri. 
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.