to have seen and shot a long giant anaconda, a claim for which he was ridiculed by scientists. He reported other mysterious animals unknown to zoology, such as a small cat-like dog about the size of a foxhound, which he claimed to have seen twice, and the giant Apazauca spider, which was said to have poisoned a number of locals. Fawcett made seven expeditions between 1906 and 1924. He was mostly amicable with the locals through gifts, patience, and courteous behaviour. In 1908, he traced the source of the Rio Verde (Brazil) and in 1910 made a journey to Heath River (on the border between Peru and Bolivia) to find its source, having retired from the British army on 19 January. In 1911, Fawcett once again left his home and family to return to the Amazon and chart hundreds of miles of unexplored jungle, accompanied by his trusted, longtime exploring companion, Henry Costin, and biologist and polar explorer James Murray. He also developed a theory that the ruins of an ancient city, which he named “Z,” lay hidden in the jungle. After a 1913 expedition, he supposedly claimed to have seen dogs with double noses. These may have been double-nosed Andean tiger hounds. Based on documentary research, Fawcett had by 1914 formulated ideas about a "lost city" he named "Z" (Zed) somewhere in the Mato Grosso region of Brazil. He theorized that a complex civilization once existed in the Amazon region and that isolated ruins may have survived. Fawcett also found a document known as Manuscript 512, written after explorations made in the sertão of the state of Bahia, and housed at the National Library of Rio de Janeiro. It is believed to be by Portuguese bandeirante , who wrote that in 1753 he had discovered the ruins of an ancient city that contained arches, a statue, and a temple with hieroglyphics; the city is described in great detail without providing a specific location. This city became a secondary destination for Fawcett, after "Z". (See Fawcett's own book Exploration Fawcett.) At the beginning of the First World War Fawcett returned to Britain to serve with the Army as a Reserve Officer in the Royal Artillery, volunteering for duty in Flanders, and commanding an artillery brigade despite being nearly 50 years old. He was promoted from major to lieutenant-colonel on 1 March 1918, and received three mentions in despatches from Field