Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating.
Emperor penguin - Aptenodytes forsteri. This is the largest species of penguins. Emperor penguins are only found on and around the Antarctic continent, on the thick pack ice and rarely on mainland. They have a pale yellow, open (breast and chin patch are one) patch on chin and breast. A long, thin and curved bill, typical for fish eaters. Very dark grey back and blue black head.
King penguins are found in the temperate waters of the islands in the Subantarctic regions, in the northern shores of Antarctica, South Georgia, and other temperate parts of the region. Its subspecies, A. p. patagonicus is found in the South Atlantic.