This was the plant life. Then He moved on to a higher form of life and created the fish. After the fish, He created the birds. Each subsequent life form was a little more complex and had a higher capacity than the one previous to it. Plants can do virtually nothing.
Fish are a little more intelligent.
Birds have even a little more capacity. They can fly, sing, and seem to have more intelligence than the fish. A fish can just swim around in a tank. Up until this point, the animal life was highest form of life that God had created on the earth. But then God created man out of the dust of the earth.