Answer:
A horrid monster hides from the day, with many legs and many eyes. With silver chains it catches prey. And eats it all before it dies. Yet in every cottage does it stay. And every castle beneath the sky.
What's a place you have left but didn't enter?
I fly through the air on small feathered wings, seeking out life and destroying all things.
Hard to catch, easy to hold. Can't be seen, unless it's cold.
Two people are born at the same moment, but they don't have the same birthdays. How could this be?
Break me and I am better immediately set and harder to be broken again.