In the begining of chapter 3 how does Golding describe Jack ?

In chapter 3 of Lord of the Flies, Jack is going through a
great transformation which is evident by his change in dress and actions.  At the
beginning of this chapter, Jack is bent over, hunting, and acting like an animal.  "Then
dog-like, uncomfortably on all fours yet unheeding his discomfort he stole forward five
yards and stopped."  Golding is comparing Jack to a dog who is on the prowl.  "He closed
his eyes, raised his head and breath in gently with flared nostrils..."  Jack is down on
the ground and is only wearing shorts and carrying a sharpened stick - his spear.
 Golding also states that Jack acts "ape-like among the tangle of trees."  The imagery
that is used to describe Jack is not that of a young, cultured, British boy, but rather
one who is quite comfortable behaving like a savage hunting his
prey.