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.
Female emperor penguins, Aptenodytes forsteri, lay a single egg, which is then incubated by the male in a special pouch on top of the feet. Incubation lasts 62-67 days during which time the male fasts and the female returns to the sea to forage.