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 emperor penguin (Aptenodytes forsteri) is the species that lives in the coldest habitat of all since some Antarctic zones reach a temperature as cold as -40Âº or -60Âº C. To withstand the effects of this harsh climate, their feathers, and their abundant body fat are their best resources.