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.
Penguin colonies can consist of tens of thousands of birds, with the largest known colony on St Croix Island near Port Elizabeth, South Africa, numbering 50,000. 8. A penguinâs eyes work just as well underwater as they do above ground. A penguinâs eyesight is very sharp, and works just as well underwater as it does in the air. Because penguins eat a wide variety of undersea prey â including fish, krill, and molluscs â this trait enables them to find food more easily, even in dark, cloudy, or murky water.