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.
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).