The answer is a fly
I have a worm-like body with fifteen or more pairs of legs, I hide by day and hunt at night, I have poisonous jaws that can paralyze its victims, My bite can be excruciating to a mere mortal I can be found throughout Asia
What am I?
I get bigger each day and smaller by night. I say bye to you at night. And I am always with you in the morning. What am I?