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.
Index of Types of Penguins. There are typically 17 different species of penguin recognised as living in the world today. Each species belongs to a larger grouping of closely related species known as a genus. The living penguins comprise six genera (the plural of genus): Aptenodytes, Eudyptes, Eudyptula, Megadyptes, Pygoscelis, and Spheniscus (you can see which species belong to each genus by clicking on the link).