Many have heard me, yet nobody has seen me. I won’t speak back unless spoken to. What am I?

An echo!

Explanation:

Many people can hear an echo, but you can't see them obviously. An echo also only happens when another sound takes place which makes sense because of the line "I won't speak back unless spoken to."

a lion king of the jungle he watch's his pray and watch out and go hunting for food and go fight   other animals to protect his cubs from getting hurt