Answer:
You heard me before and then again. Afterward I die, until you call me again. What am I?
In all the world, none can compare, I am a tiny weaver; my deadly cloth so silky and fair. What am I?
When you need me, you must find me. When you find me, you no longer need me. What am I?
I always go to bed with my shoes on.
I shift around though always slowly. I never move more than a few inches at a time. A large movement by me can kill many people. I am huge yet unseen by humans.
The strangest creature you'll ever find: Two eyes in front and many many more behind.