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.
Out of these adelie and emperor penguins are known to breed in Antarctic all year-round. The largest species emperor penguin lives 66o to 78o south latitude. They seldom go beyond Antarctic but migrating birds do fly near the Falkland Islands, southern New Zealand, and southern South America.