First, it is dark, meaning that it is not in the form of stars and planets that we see. Observations show that there is far too little visible matter in the Universe to make up the 27% required by the observations. Second, it is not in the form of dark clouds of normal matter, matter made up of particles called baryons.
Livestock[edit] The raising of livestock, sheep (the traditional mainstay for generations of Icelandic farmers) and cattle (the latter grew rapidly in the 20th century), is the main occupation, but pigs and poultry are also reared; Iceland is self-sufficient in the production of meat, dairy products and eggs.
Brangus is an interesting type of beef cattle that has developed from the Angus and Brahman breeds. Most guidelines say that they should be about 37.5% Brahman and 62.5% Angus! Brangus cattle were bred to combine the excellent beef quality of Angus with something a little hardier, like the Brahman. Their distinctive look comes from their fairly large ears, loose and folded skin, quite a pronounced hump on bulls' backs and a rounded rump.