Taxonomy has come a long way since Mr. Linnaeus first divided things up into Animal, Vegetable, and Mineral. I remember learning about the protista in high school and being a little disappointed that such a primitive life form could get equal billing with the entire animal kingdom.

Wikispecies is an attempt to provide a directory of the tree of life, and I thought it would be a fun challenge to start at the Animal Kingdom and try to navigate my way directly down through the classifications until I arrived at human beings. At each level, I picked the subcategory that sounded most promising, using the photos of example creatures as guides. I ran into trouble right away, and my path was far more meandering than I would have expected.

If you want a tough challenge of your knowledge of Latin and zoology, give it a try before looking at my wandering path below.
Animalia
-Eumetazoa
--Radiata [this can't be right]
-Eumetazoa
Animalia
-Agnotozoa [some kind of slimy mess]
Animalia
-Parazoa [coral? what the heck]
Animalia
-Eumetazoa
--Protostomia
---Arthropoda [some buggy shrimp]
--Protostomia
---Brachiopoda [great. shells]
--Protostomia
-Eumetazoa
--Deuterostomia [cool, something cute!]
---Chordata
----Vertebrata
-----Hyperoartia [crap]
----Vertebrata
-----Gnathostomata
------Osteichthyes
-----Gnathostomata
------Tetrapoda [?!]
-------Mammalia
--------Theria / Theria (Geometridae)
-------Mammalia
--------Prototheria [swell, found the monotremes]
-------Mammalia
--------Incertae sedis (Mammalia)
---------Gondwanatheria [just had to look]
--------Incertae sedis (Mammalia)
---------Multituberculata [we have to be around here somewhere]
--------Incertae sedis (Mammalia)
-------Mammalia
------Tetrapoda
-------Synapsida [so confused]
--------Pelycosauria
---------Eupelycosauria
----------Sphenacodontidae [need some pictures, please]
-----------Sphenacodon [jeez, it's a dinosaur!]
----------Sphenacodontidae
---------Eupelycosauria
--------Pelycosauria
-------Synapsida
------Tetrapoda [obviously wrong]
-----Gnathostomata
----Vertebrata [okay, infraphyla are false ends, skip to classes]
-----Conodonta [nope]
----Vertebrata
-----Pteraspidomorphi
----Vertebrata [try orders]
-----Thelodonti
----Vertebrata
-----Anaspida
----Vertebrata
-----Galeaspida [hopeless]
----Vertebrata
---Chordata
----Vertebrata
-----Pituriaspida
----Vertebrata
-----Osteostraci
----Vertebrata
---Chordata
----Cephalochordata
-----Branchiostomidae
----Cephalochordata
---Chordata
----Urochordata
---Chordata
----Incertae sedis (Chordata)

Here I gave up, searched for homo sapiens and peeked at the the trail as far as

Eukaryota
-Animalia
--Eumetazoa
---Deuterostomia
----Chordata
-----Vertebrata
------Gnathostomata
-------Tetrapoda [!]
--------Mammalia
---------Theria
----------Placentalia

carrying on ...

-----------Primates
------------Haplorrhini
-----------Primates
------------Strepsirrhini
-----------Primates
----------Placentalia
-----------Carnivora
----------Placentalia
-----------Chiroptera
----------Placentalia
-----------Cingulata
----------Placentalia
-----------Dermoptera
----------Placentalia
-----------Primates
------------Haplorrhini [pure guess]
-------------Simiiformes [planning to exhaust all the branches]
--------------Catarrhini [guess]
---------------Hominoidea [aha]
----------------Hominidae
-----------------Homininae
------------------Hominini
-------------------Hominina
--------------------Homo
---------------------H. sapiens
----------------------H. s. sapiens

After all this, I'm not feeling very sapient.