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.
Aptenodytes patagonicus. The above picture was taken at Indianapolis zoo, in April, 2001. Look at the dinosaur-like feet of this penguin, indicating its evolutionary ancestors. Note that the two shorter penguins with the different plumage and pink feet belong to a different species, the Rockhopper Penguin.King penguins live in the shores of Antarctica, eating small fish and squids. They are excellent divers, and can stay over an hour in the water to find food.A colony of King penguins may consist of over a million individuals.ptenodytes patagonicus. The above picture was taken at Indianapolis zoo, in April, 2001. Look at the dinosaur-like feet of this penguin, indicating its evolutionary ancestors. Note that the two shorter penguins with the different plumage and pink feet belong to a different species, the Rockhopper Penguin.