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.
The name of each group and types of penguins that belong in their category are as follows: 1  Aptenodytes â Emperor and King penguins belong to this category. 2  Eudyptes â Erect-Crested, Fiorland, Macorni, Rockhopper and Snares belong here. 3  Eudyptula â only âLittleâ penguins belong to this group.