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.
Photo Credits: Omaha's Henry Doorly Zoo and Aquarium. The penguins at Omahaâs Henry Doorly Zoo and Aquarium are Southern Rockhopper Penguins (Eudyptes chrysocome). They are found in subantarctic waters of the western Pacific and Indian Oceans, as well as around the southern coasts of South America.