Answer:
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.
What is pronounced like one letter, written with three letters. And belongs to all animals?
There are millions of me. I am very small but when moving fast I am deadly.
A time when they're green. A time when they're brown. But both of these times, cause me to frown. But just in between, for a very short while. They're perfect and yellow. And cause me to smile.
Put into a pit, locked beneath a grate, guarded through the night, yet it still goes out.
People take me on walks and I run and have fun. What am I?