Answer:
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
A serpent swam in a silver urn, A golden bird did in its mouth abide, The serpent drank the water, this in turn, Killed the serpent. Then the gold bird died.
What types of words are these: madam, civic, eye, level?
Iron on a mammal. Mammal on your feet.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?