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.
Out of these adelie and emperor penguins are known to breed in Antarctic all year-round. The largest species emperor penguin lives 66o to 78o south latitude. They seldom go beyond Antarctic but migrating birds do fly near the Falkland Islands, southern New Zealand, and southern South America.