Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating.
Emperor penguins owe their scientific name (Aptenodytes forsteri) to their discoverer, the first natural scientist to reach Antarctica, the German Johann Reinhold Forster. Forster came to Antarctica in 1770, on Captain James Cook's ship, and saved Cook's life during the voyage.
Macaroni penguins are the most abundantly found species of penguins. They are seen in areas spanning the Subantarctic to the Antarctic peninsula. These penguins are found in South Chile, the Falkland Islands, South Orkney Islands, and South Georgia and the South Sandwich Islands (SGSSI).