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. Man was created to be the image-bearer of God and to rule on the earth over all of the creation.