the different between a Colby and American Pitt bull?

Answer 1

I found this on Wikipedia,
about the american pit bull.
I will give you the link to the index of pit pull breeds, the second link will be to the american pit bull.

The three “pit bull” breeds all have nearly identical standards, with only the acceptable sizes and colors varying. Also, the AST and the APBT have the same heritage. Many people still consider them to be simply different types of the same breed. Dogs registered with the UKC as an APBT are often dual registered with the AKC as an AST.

During the "Great Depression of the 1930's" the American Kennel Club added Colby Pit Bull Terriers to their registry under the name of Staffordshire Terriers.

The family of dogs, the "Colby Dogs", are probably the oldest, purest strain of dogs in the world.

See the colbypitbull site (third link) and under links are people who sell these dogs. also the people who own the colby pit bulls sell under the menu -puppy and dog.

the Colby or Staffordshire terriers have a broad head, defined occipital muscles, a relatively short foreface, half prick ears, dark round eyes and a wide mouth with a clean scissor-like bite. The ears are small and either rose or half-prick. The cheek muscles are usually pronounced and give the impression of strength. Their lips show no looseness, and they rarely drool. The Staffie is a dog with extreme strength for its size with unbeatable bravery. The head tapers down to a strong well muscled neck and shoulders placed on squarely spaced forelimbs. Their rib cage is well sprung and is topped by a level top line.
They may be coloured black, brindle, red, blue, white, or any blending of these colours with white.
White with any colour over an eye is known as piebald or pied.
Liver-coloured and black and tan dogs sometimes occur but these are considered an unacceptable colour for the showring or any reputable breeding program.
more informaion
check the fourth link