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 Adelie Penguin is an Antarctic penguin, closely related to the Gentoo [link] and Chinstrap [link] penguins. Together, these three species are known as the brushtail penguins. The Adelie Penguin is a relatively small species with a black back and head, a white front, and a characteristic white ring around the eyes. Though Adelie Penguins live mostly on the continent of Antarctica (and a few associated islands), they mate and nest on rocky shores, rather than on the ice. Both parents take turns caring for a clutch of two eggs that are laid in a stone nest. While one parent incubates the eggs, the other parent feeds.