Continent world ultimately persisted with these being regarded as separate continents. From the late 18th century, some geographers started to regard North America and South America as two parts of the world, making five parts in total. Overall though, the fourfold division prevailed well into the 19th century. Europeans discovered Australia in 1606, but for some time it was taken as part of Asia. By the late 18th century, some geographers considered it a continent in its own right, making it the sixth (or fifth for those still taking America as a single continent). In 1813, Samuel Butler wrote of Australia
Smallest organisms smallest crocodilian is the Cuvier's dwarf caiman ("Paleosuchus palpebrosus") from northern and central South America. It reaches up to in length. One of the smallest snakes known is the recently discovered Barbados threadsnake ("Leptotyphlops carlae"). Adults average about long, which is only about twice as long as the hatchlings. The Common blind snake("Indotyphlops braminus") measures long, uncommonly to long. The smallest known dinosaur (excluding modern birds) is "Anchiornis", a genus of feathered dinosaur that lived in what is now China during the Late Jurassic Period 160 to 155 million years ago. Adult specimens range from long, and the weight has