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.
Whales in Iceland. There are a handful of whale species that feed and breed off the Icelandic coast. Most common to spot during a whale-watching tour are minke whales and the humpback whales, plus a few types of porpoises and dolphins, but lucky travellers can also see blue whales and orcas during certain times of the year. Read about whale watching in Iceland here.