Taxonomy works much like a Hierarchy. The most specific Level is Species and the most Broad is the Domain. There are three Domains and the animals there are classified into 6 Kingdoms and this continues until you go to the Species which is very specific.




Domain
Domain Archaea
This is a domain for single-celled organisms and that have one kingdom Below them in Clasification. They do not have a Nucleus and no Nuclear Membrane, they also do not have organelles. Thesehave 3 RNA Polymerase. 

Domain Bacteria 
This Domain is for bacteria, the single celled organisms that like the Archea Organisms have no nuclear membrane or organelles. These Prokaryotic organisms may lay asleep for many years and only awake when they need to. They Also have only 1 Kingdom Beneath them.
Domain Eukarya
This domain is for Eukaryotic cells. These have the cell structure that is normal with both a nucleus and a Cell membrane. These are the most common and they have four Kingdoms beneath them. All Eukaryotic


Kingdom
Kingdom is the second largest clasification rank in the modern Taxonomy levels. It is divided into the way that the organism feeds, what its cells are like and the number of cells in their body. Below All 6 Kingdoms From the previous 3 Domain's are listed. We Will go ahead and go in Depth with Kingdom Animalia and Kingdom Plantae to show their phylum.
Kingdom Protista, Kingdom Fungi,  Kingdom Monera 

Kingdom plantae (Plants)
Contains 4 Phylum

Phylum Bryophyta
Not Vascoularized 
Short Close to ground (Because they need Osmosis)
No Roots but Rhizoids
Rhizioids help to absorb Water and Food.
Example: Liverworts

Phylum Pteridophytae: 
Extremely Diverse
No Seeds
Have Vascular system
Sexual Reproduction through spores
Example: Ferns

Phylum Angiosperms: 
Largest Phylum
Flowered plants
Double Fertilization
Stamens with 2 pollen sacks
Example: Pineapple

Phylum Gymnosperms:
Naked Seed
Exposed Seeds
More than 1 Lineage
Not Flowering
Example: Palm Tree's














Kingdom Animalia (Animals)
All Animals classified here. These are Multicellular organisms that are Eukaryotes. They Depend on other organisms for food meaning they are Heterotrophs. From Here We Will decend the Phylum Chordata.

Phylum Porifera
Usually Sponges
Marine, Few fresh water organisms
Cylindrical body
Example: Sponge


Phylum Cnidaria
Mostly Marine Animals
Cylindrical Body or with Radial symmetry 
Body Wall Contains Many Ostia that allow water to penetrate inside the Animal
Example: Sycon

Phylum Platyhelminthes
3 Tissues with Organs and Organelles
No Internal Cavity
Flattened body
Bilateraly Simmetrical body shape
Example: Flatworm

Phylum Aschelmeinthes
Mostly Parasitic beings
Long Cylindrical Body
Complete Digestive System
Respiration by Simple Diffusion
Has a Nervous system with a nerve ring and sideways nerve chords
Only Sexual Reproduction
Example: Dracuculus (Guinea Worm)


Phylum Annelida
More than two cell layers with tissues and organs
Closed Circulary System
No Respiratory Organs
Lives in most enviornments
3 Body Sections Prosomium, Trunk and Pygdium
Example: Leeches

Phylum Anthropada
Mainly Symetrical
Body Cavity is true
3-400+ pairs of legs
Body divided in 2-3 sections
Nervous system contains Brain and Ganglia
Anything is food
Live Everywhere
Example: Dung Beetle

Phylum Mollusca
No Body Cavity
Has Mouth and Anus
Open Circulatory System
Pair of Kidneys
Reproduction is Sexual or Gonochoristic
Feed on Alot of stuff
Example: Snail

Phylum Echinodermata
5 Rayed Symmetry
Body has more than 2 Cell and Organ layers
Water Vascular system
Feeds on fine marine particles
Live in All Marine Environments
Example: Sea Urchin








Phylum Chordata
During Embryotic Development 
Notochord provides Skeletal Support
Dorsal Hollow Nerve cord that provides a central nervous system
7 Main Classes

Agnatha Class
Jawless Fish
Earliest Vertebrates
Notochord
Most have Cartilage Skeleton
Pineal Eye
Example: Lamprey

Chondrichthyes Class
Cold Blooded
Cartilage Skeleton
Tough Skin
Teeth Usually not Attatched to Jaw
Usually Live in water
Example: Spotted Eagle Sting Ray

Osteichthyes Class
Skin Mucous
Scales
Paired Fins
Usually Many Teeth
Have Jaw
Example: Australian Lungfish

Amphibia Class
Amphibious
Cold-blooded or Exothermic animals
Smooth skin with Mucus and poison glands
Four Limbs
Bone Endoskeleton
Large Mouth
Example: Newt

Reptilia Class
Creeping Reptiles
Cold Blooded
Scales come from epidermis
Spinal columns
Strong Skeleton
All except Crocodile have 3 Chamber Hearts
Example:  Scarlet King Snake

Aves Class
Birds
Exoskeleton Feathers
Paired Limbs
No Sweat Glands
Worm-Blooded
Four Division Body Head, Neck, Trunk, Tail
Example: Toucan







Mammalia Class
Extremely Diverse
Endothermic
Hair
Fast Metabolism
Very Advanced
Example Bolivian Chinchilla





Order 
The 4th most specific Taxonomy Level decided by the character of the organism and by the sharing of families

Family 
Members of the Same Family share a common attribute.


Genus  
This Is Organisms that are structurally Similar and phylogenetically related.



Species
Lowest Taxonomy Rank And the most basic category of biological taxonomy. Common Characteristics And together can produce Offspring.