If you don’t have square paper, take a rectangular piece of paper and fold one corner down and align the edges. You will have a triangle shape with your fold and a rectangular portion left over. Remove the rectangular portion to end of with a square.
Lay your paper on the table with the colored side facing down and the white side up. If your paper has two different colored sides, note which one is facing up and which one is facing down. If your paper is the same color on both sides, make a small mark or draw a design to identify the two sides. For example, mark the bottom side facing the table. This mark will help you know which side of the paper is currently facing you. The side or color that starts facing the table will be the side or color that you will see when the bird is complete.