Monsters in Beowulf (Grendel, Grendels mother, or the dragon)

Choose one of the monsters in Beowulf (Grendel, Grendel mother, or the dragon). What symbolic value does this creature seem to have? How is he/she connected to nature or to the past, and how do his/her values differ from those of the warrior society? Where do you see similarities and differences (to/from the warriors) in his/her actions or practices, and why are these differences (or similarities) meaningful? What do these monsters potentially tell us about the warrior society's eventual doom?