Answer:
When set loose I fly away. Never so cursed as when I go astray.
Glittering points that downward thrust. Sparkling spears that never rust.
Stealthy as a shadow in the dead of night, cunning but affectionate if given a bite. Never owned but often loved. At my sport considered cruel, but that's because you never know me at all.
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
I always have to work with something in my eye. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?