Letter - Archive; John Cotton; 1843-1849; Letter on single sheet of paper folded into four; written (presumably) by ornithologist John Cotton to his brother circa 1834-1848. It begins ' The principle peculiarity in Australian Zoology is the total absence of large quadrupeds; and the paucity of the smaller birds...' The inside folds contain two sketches of mammals; described as a flying 'opossum' and a rat; the back illustrates the beak