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.
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.