Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating.
Emperor penguin - Aptenodytes forsteri. This is the largest species of penguins. Emperor penguins are only found on and around the Antarctic continent, on the thick pack ice and rarely on mainland. They have a pale yellow, open (breast and chin patch are one) patch on chin and breast. A long, thin and curved bill, typical for fish eaters. Very dark grey back and blue black head.
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.