Question: In what year was the man who sent three specimens of desert rat-kangaroo to John Gould born?
Context: Pravusuchus is an extinct genus of leptosuchomorph phytosaurid phytosaur known from the Late Triassic (Norian stage) of Arizona, United States.  It contains a single species, Pravusuchus hortus, which is known from three specimens.  These specimens were previously referred to "Smilosuchus" or to "Leptosuchus", but "Pravusuchus"'s autapomorphy, its phylogenetic position as well as a trait shared with pseudopalatines, justified the erection of a new taxon for the material. The Zaccheus Gould House is a historic First Period house at 85 River Road in Topsfield, Massachusetts.  The oldest part of the house was built c. 1670, probably for Zaccheus Gould by John Gould, one of the founders of Topsfield.  The house is a 2.5 story five bay wood frame structure.  The older portion of the house is on the right of the central chimney; the portion on the left is estimated to have been added c. 1700.  The workmanship on the exposed framing elements inside the house suggests that the same workman also worked on the Stephen Foster House. John Gould FRS ( ; 14 September 1804 – 3 February 1881) was an English ornithologist and bird artist.  He published a number of monographs on birds, illustrated by plates that he produced with the assistance of his wife, Elizabeth Gould, and several other artists including Edward Lear, Henry Constantine Richter, Joseph Wolf and William Matthew Hart.  He has been considered the father of bird study in Australia and the Gould League in Australia is named after him.  His identification of the birds now nicknamed "Darwin's finches" played a role in the inception of Darwin's theory of evolution by natural selection.  Gould's work is referenced in Charles Darwin's book, "On the Origin of Species". The desert rat-kangaroo ("Caloprymnus campestris"), also called the buff-nosed rat-kangaroo, plains rat-kangaroo or oolacunta, is an extinct small hopping marsupial endemic to desert regions of Central Australia.  It was discovered in the early 1840s and described by John Gould in London in 1843, on the basis of three specimens sent to him by George Grey, the governor of South Australia at the time. Hemimyzon sheni (Shen's river loach) is a species of ray-finned fish in the genus "Hemimyzon".  It is only known from Tar-Ju River basin, Taitung County, southeast Taiwan, where its type locality is.  Only three specimens were collected and later attempts to find more specimens have failed.  Among its relatives, "H. sheni" most closely resembles "H. formosanus", but it seems to be more a head-water species than "H. formosanus".  It is a small species with standard length of 5 cm . Larry Stephen Gould (born August 16, 1952 in Alliston, Ontario) was a retired professional ice hockey player who played two games in the National Hockey League.  He would play with the Vancouver Canucks.  Larry is the brother of John Gould. Sir George Grey, KCB (14 April 1812 – 19 September 1898) was a British soldier, explorer, Governor of South Australia, twice Governor of New Zealand, Governor of Cape Colony (South Africa), the 11th Premier of New Zealand and a writer.  By political philosophy a Gladstonian liberal and Georgist, Grey eschewed the class system for the prosaic life of Auckland's new governance he helped to establish. Gould's mouse ("Pseudomys gouldii") lived in eastern inland Australia, and was named after John Gould.  It was slightly smaller than a black rat, and quite social, living in small family groups that sheltered by day in a nest of soft, dry grass in a burrow.  It usually dug burrows at a depth of 15 cm under bushes.  Gould's mouse was common and widespread before European settlement, but disappeared rapidly after the 1840s, perhaps being exterminated by cats. Alternatively, it may have been out-competed by the introduced rats and mice, succumbed to introduced diseases or been affected by grazing stock and changed fire regimes.  Despite extensive survey work in its known range, the last specimens were collected in 1856–57, and it is presumed to be extinct. The broad-faced potoroo ("Potorous platyops") is an extinct species of marsupial that once lived in Australia.  The first specimen was collected in 1839 and described by John Gould in 1844, but even then it was rare and only a handful of specimens were ever collected, the last in 1875.  Subfossil remains indicate that it originally had an extensive distribution from the semiarid coastal districts of South Australia to the Western Australian coast, and possibly as far north as North West Cape. The long-tailed hopping mouse ("Notomys longicaudatus") is an extinct species of rodent in the family Muridae.  It was found only in Australia.  It is known from a handful of specimens, the last of which was collected in 1901 or possibly 1902.  It is presumed to have become extinct within a few decades from then – possibly several decades in view of a skull fragment found in an owl pellet in 1977.  The cause of extinction is unknown, but may be a variety of factors including predation and habitat alteration.  Little is known of its biology other than that it dug burrows in stiff clay soils.  It was less a pest to humans than other hopping mice, although it would eat raisins.  The mouse was mainly gray in colour with small pink ears and big eyes with a long hairy pink tail about two inches longer than its own body.  It was first described by John Gould on the basis of specimens sent to him from Australia.
Answer: 1812