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.
Their habitat ranges from the ice shelf on Antarctica, like the emperor penguin, to some temperate islands near the equator, like the Galapagos penguin. Also, some penguin species live in South Africa and Australia. Subarctic islands, Tierra del Fuego, South Georgia Island.