What is this?

Stalking more silently than a hunter,
Making a kill more regularly than Jack,
Though it hunts more than pigs,
Preys on the choir,
Grabs them with icy, needle sharp claws,
Long black fur hides it's face,
Where red eyes gleam,
Captured the littluns,
Moves through the trees with out a sound,
Crouches on the mountain,
Comes in the night,
When all is dark and the littluns whimper at the sight,
Attacked solitary Simon,
Disguised as the Lord,
Though he and Ralph broke free from the toils,
And ran to stay that way,
Steers clear of Piggy,
Followed Jack who made it his weapon,
More deadly than a spear,
What is this,
It is fear.