The Strigidae family, or Owl family, is a little confusing. All owls, with the EXCEPTION of the barn and bay owls are classified as strigidae (which means 'owl' or 'night bird'). The Strigidae are known as the 'typical owl' family.The barn owl family is called Tytonidae and includes 11 species of barn owl and their allies.hey are also known as raptors.. All of these birds are faunivores-their diet consists of animals. The hawk and falcon families are diurnal, that is, they are most active during broad daylight. The owl families are mainly nocturnal, meaning that they are more active at night.
Bismuth gets its name from the German word wissmuth meaning white mass and the latin word bisemutum. Often confused with tin and lead due to its resemblance to those elements. Bismuth was utilised in ancient times by the Egyptians, Greeks, Asians, Romans and Chinese.
Bismuth, a pentavalent post-transition metal, chemically resembles arsenic and antimony. Elemental bismuth may occur naturally, although its sulfide and oxide form important commercial ores.The free element is 86% as dense as lead. It is a brittle metal with a silvery white color when freshly produced, but is often seen in air with a pink tinge owing to surface oxidation.hereas bismuth is most available today as a byproduct, its sustainability is more dependent on recycling. Bismuth is mostly a byproduct of lead smelting, along with silver, zinc, antimony, and other metals, and also of tungsten production, along with molybdenum and tin, and also of copper production.