Answer:
When they are caught, they are thrown away. When they escape, you itch all day.
I come in many colors, some are blue and white. While some people annoy me, I am not much for the fight. I live where people rarely tread, but you will find me close to bed. What am I?
The ones in the sea are prickly, but the ones on the street might pickpocket you.
Microparasite expert at sucking the blood of mammals and birds
I'm carried by mad animals. What am I?
What is so fragile that saying its name breaks it?