Answer:
I know a word of letters three. Add two and fewer there will be. What is the word?
When I am caught I am thrown away. When I escape you itch all day.
I am the signature stroll of ducks and penguins
I am a type of animal that hang out in the mist
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?