Wild "yellowhammer" cattle is a fictional reference in Patrick Smith's book which is called A Land to Remember. There is no breed commonly recognized as yellowhammer.
Florida
"Yellow-hammer cows" are not specifically animals of the bovine species, but rather a reference to the community of the world (which fits the acronym C.O.W) and how they are trying to keep up with changing technology, comparing this webpage with that webpage or this software with that software, etc. However, the term "yellow hammer cows" that you are thinking of have come from Patrick Smith's book called "A Land Remembered" where it mentions about wild "yellowhammer" cattle, which may be in reference local name (or the author's coined name) for the Florida Cracker/Pineywoods/Scrub cattle that live[d] there in Florida. Check out the related links below for more.
It's not specifically referring to the bovine animal cow, but actually the acronym COW, which means Communities Of [the] World, and refers to how technology (in computers and art) has changed so quickly over the years. It may have also come from Patrick Smith's book called "A Land Remembered" where it mentions about wild "yellowhammer" cattle, that may be a local name for the Florida Cracker/Pineywoods/Scrub cattle that live[d] there. Check out the related links below for more.
Cattle are found in all states.
You will never find a cow that is truely blue in colouration (like that of the sky or of the control panel to the left on this page), but you will find blue-roans who often have a smoky-blue colouration due to the black and white hairs mixed together. Shorthorn-Angus crosses and Belgian Blues are such cattle that often come in blue-roan colouration. Unlike blue cows, though, you will find yellow cattle. These are often called buckskin-coloured or blonde cattle than yellows. Blonde d'Aquitaine, Charolais, Gelbvieh, Guernsey, Simmental-Fleckvieh, and Charolais-Angus-Hereford cross cattle are examples of breeds and crosses, respectively, that can all come in yellow-coat colouration.
Hammer heads are NOT all "like a hammer". They come in many different shapes.
The working principle of the automatic hammer is that it crushes all the objects that come in contact with the hammer.
cattle
By ships.
Beef products come from cows! From the bodies of cattle, cows, bulls etc, etc,
Angus cattle are a Scottish breed of beef cattle that originated from Scotland.
Ships that brought settlers to Australia also brought cattle with them. So cattle were shipped to Australia overseas.