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.
Emperor Penguins, Aptenodytes forsteri. Description & Behavior. The scientific name for emperor penguins, Aptenodytes forsteri (Gray, 1844), is made up of Aptenodytes, which means featherless diver and forsteri, for J.R. Forster, a naturalist and colleague of Captain Cook in the 18th century who was one of first to describe penguins.