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.
Species: 1  Aptenodytes forsteri (emperor penguin) 2  Aptenodytes patagonicus (king penguin) 3  Eudyptes chrysocome (southern rockhopper penguin) 4  Eudyptes chrysolophus (macaroni penguin) 5  Eudyptes filholi (eastern rockhopper penguin; considered by some to be a subspecies of southern rockhopper) 6  Eudyptes moseleyi (northern rockhopper penguin)