Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating.
Emperor penguins owe their scientific name (Aptenodytes forsteri) to their discoverer, the first natural scientist to reach Antarctica, the German Johann Reinhold Forster. Forster came to Antarctica in 1770, on Captain James Cook's ship, and saved Cook's life during the voyage.
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.