I don't understand your question. The Old Testament of the Bible, in Genesis 1:26, contains this sentence. "And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth." That's the most famous English translation (KJV). A more modern English translation (NET Bible) says: "Then God said, “Let us make humankind in our image, after our likeness, so they may rule over the fish of the sea and the birds of the air, over the cattle, and over all the earth, and over all the creatures that move on the earth. Birds lay eggs. Amphibians such as frogs lay eggs. Reptiles lay eggs. Fish lay eggs. They are "oviparous." Mammals do not lay eggs. They bear live young. They are "viviparous." (There are two exceptions: the platypus and the echidna). Reptiles include snakes, turtles, and lizards. "Creeper" is NOT a very good description. Lizards, for example, can walk and run.

The Animal Kingdom includes anything from the simplest bacteria to the elephant, and everything in between. Some, like mammals feed their young milk. Some do not give birth to live young, They are classified according to significant differences and similarities.

I don't fully understand your question but I think you are asking about bird's biological classification. Such as under the animal kingdom. Birds are classified as birds (aves) - under CLASS Kingdom - Animal Phylum - Chordata Class - Aves Here's a resource "http://www.environment.gov.au/node/14189"

Classes? - Mammals, Birds, Reptiles, Fish, Amphibians, Invertebrates?