Answer:
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
What zips through the sky with a tail of fire and dust. It could be an omen, its origin to discuss?
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
People take me on walks and I run and have fun. What am I?