The beastie or beast is not a real person or creature. Although at varius times the boys think that it might be a snake-thing, a giant squid, a ghost or a winged creature with sharp teeth and claws it is none of the these things. The beast is simply the boys themselves, it is the capacity to do evil which lies inside us all.
Beastie is the evil that resides in all of the boys, or as the author would say, "in all mankind". The pig's head on a stick is the physical manifestation of this evil.
beastie
A beastie
lord of the flies
the beastie
The creature in "Lord of the Flies" is called the "Beast" and symbolizes the inherent evil and darkness within the boys on the island. It represents their fear and descent into savagery as they struggle to maintain civilization.
Read the book really....
The boy who was talking about the "beastie"
He sees a snake beastie thing in the jungle.
The "Beastie" is the evil inside everyone of the boys. This evil is the force that kills Simon. In physical identity, the boys mistook a dead paratrooper for a jungle "Beastie"
I'm pretty sure that's the chapter where the boys mistake him for the "beastie" and they kill him.
He thought he saw a snake-thing or beastie.
The beast has several names already in the book Lord of the Flies. It is initially referred to as a snake-thing or beastie. Later during his internalised conversation the beast is named as the Lord of the Flies. Finally the real nature of the beast is revealed as the darkness in the hearts of men.