What Am I Riddles

Question: What is square and green?

Question: What is big, has 4 feet, and can fly?

Question: Decapitate me and all becomes equal. Then truncate me and I become second. Cut me front and back and I become two less than I started. What am I?

Question: Black within and red without with four corners roundabout.

Question: I fly like a bird of many colors through the sky. i am made with both wood and fire but i do not burn up.You can see me clearly during the day, but i am nearly invisible at night. What am I?