Answer:
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
I am the signature stroll of ducks and penguins
I wear a green jacket on the outside white jacket as a second layer and red jacket inside. I am pregnant with a lot of babies. (one word)
Can not be bought, Can not be sold, Even if it's made of gold. What is it?
You are my brother, but I am not your brother. Who am I?
A little house full of meat, no door to go in and eat.