I simply select the Content Aware Move tool to make a rough selection around the object I want to move. In this case the bird.
Structure: Control how far the selected edge feathers
Color: Control how far the blending of color occurs
In this case I could leave Structure as a small number since it will blend very nicely on the move. Same goes for color. Adjust these according to your image.
The other option available in the Option bar is Extend. Extend will leave the original image and make a duplicate like the image below.