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.
The emperor penguin (Aptenodytes forsteri) is the tallest and heaviest of all living penguin species and is endemic to Antarctica.The male and female are similar in plumage and size, reaching 122 cm (48 in) in height and weighing from 22 to 45 kg (49 to 99 lb).he emperor penguin breeds in the coldest environment of any bird species; air temperatures may reach â40 Â°C (â40 Â°F), and wind speeds may reach 144 km/h (89 mph). Water temperature is a frigid â1.8 Â°C (28.8 Â°F), which is much lower than the emperor penguin's average body temperature of 39 Â°C (102 Â°F).