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.
Aptenodytes forsteri. The emperor penguin is the largest of 17 species of penguin at 1.15 m (45 in.) tall. It is also the only animal to inhabit the open ice of Antarctica during the winter. They face wind chills as cold as -60Â°C (-76Â°F) and blizzards of 200 km/h (124 mph).mperor penguins are monogamous during each breeding season, choosing only one mate. Most will find a new mate the next year, but some pairs choose to reform a bond again. Once the egg is hatched, in May or June, the female will pass the egg to the male to incubate.