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.
Penguins on land. On land little penguins live in holes in the ground known as burrows. These burrows provide a place for little penguins to rest, nest and moult. Burrows also provide protection from predators and extreme heat.