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.
Almost as famous as their plus-sized cousins are king penguins, a species that breeds primarily on islands north of the Antarctic continent including the Falkland Islands, South Georgia Island and Tierra del Fuego. The coasts of Australia and New Zealand are where youâll find the most petite of the 17 species of penguins.