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.
Finally, the largest and most popular penguins belong to the genus Aptenodytes. Emperor Penguins (Aptenodytes forsteri) and King Penguins (Aptenodytes patagonicus) are tall, graceful birds with long, thin bills and striking orange color patches on their necks and lower bills.etâs take a quick tour of the extant penguin genera. Spheniscus is the genus for âtuxedo penguinsâ. Although all penguins look at least a bit like they are wearing tuxedos, Spheniscus penguins look finest of all because they have a black band of chest feathers that gives the appearance of a bow tie.