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.
King penguins are very social birds, and live in colonies with populations of up to 39,000 breeding pairs. The colonies are generally found on large, sparsely vegetated areas of the islands they inhabit because king penguins avoid climbing.ptenodytes patagonicus (king penguins) colonies are mainly located on islands surrounding Antarctica. Islands include Crozet, Falkland, Heard, Kerguelen, Macquarie, Prince Edward, South Georgia and South Sandwich.