Question: Hispaniola was found by the same person who alerted Europe of which unknown continent?

Context articles: Guacanagaríx
Thomas Leavitt (settler)
Harpalus luteicornis
Voyages of Christopher Columbus
Tylopilus
Howlite
Harry Gardiner
Cyrtophora citricola
Leatherman (vagabond)
White-necked heron

Guacanagaríx (alternate transcriptions: Guacanacaríc, Guacanagarí) was one of the five Taíno caciques of Hispaniola (island) at the date of its European discovery in 1492, by the first of the Voyages of Christopher Columbus for Spain.
Thomas Leavitt (1616–1696) was an English Puritan who was one of the earliest permanent settlers of the Province of New Hampshire.
 A farmer, Leavitt apparently followed Rev. John Wheelwright to his settlement of Exeter, New Hampshire.
 Later Leavitt moved on to Hampton.
 He was seldom involved in town business, and was described by one writer as "a quiet, useful citizen."
 He was not remarkable, except insofar as those who crossed the Atlantic, swept by storms startling to Englishmen, to settle an unknown continent, peopled by tribes with which they were unfamiliar, were unremarkable.
Harpalus luteicornis is a species of ground beetle native to the Palearctic (including Europe), and the Near East.
 In Europe, it is found in mostly Central and Eastern part of the continent.
 It is found in the following European countries or unions: Austria, Baltic states, Belarus, Benelux, France, Germany, Hungary, Liechtenstein, Moldova, Poland, Romania, Russia, Scandinavia (except for Denmark), Slovakia, Switzerland, Ukraine, and all states of former Yugoslavia (except for Republic of Macedonia, Kosovo, Montenegro, Serbia, and Voivodina).
 It is also exists in Mongolia.
In 1492, a Spanish-based transatlantic maritime expedition led by Christopher Columbus encountered the Americas, a continent which was previously unknown in Europe, leading to the colonization of the Americas.
Tylopilus is a genus of over 100 species of mycorrhizal bolete fungi separated from "Boletus".
 Its best known member is the bitter bolete ("Tylopilus felleus"), the only species found in Europe.
 More species are found in North America, such as the edible species "T. alboater", and the tropics.
 Australia is another continent where many species are found.
 All members of the genus form mycorrhizal relationships with trees.
 Members of the genus are distinguished by their pinkish pore surfaces.
Howlite, a calcium borosilicate hydroxide (CaBSiO(OH)), is a borate mineral found in evaporite deposits.
 Howlite was discovered near Windsor, Nova Scotia in 1868 by Henry How (1828–1879), a Canadian chemist, geologist, and mineralogist.
 How was alerted to the unknown mineral by miners in a gypsum quarry, who found it to be a nuisance.
 He called the new mineral silico-boro-calcite; it was given the name howlite by James Dwight Dana shortly thereafter.
Harry H. Gardiner (1871 – perhaps 1933), better known as the Human Fly, was an American man famous for climbing buildings.
 He began climbing in 1905, and successfully climbed over 700 buildings in Europe and North America, usually wearing ordinary street clothes and using no special equipment.
 "One hundred and twenty of those who have sought to imitate me in this hazardous profession have fallen to death," Gardiner is quoted as saying in a 1905 article published in "Muscle Builder".
 "There is no chance of 'rehearsing' your performance.
 Each new building is an unknown problem.
 If you do not guess the right answer, death awaits below, with a breath of up-rushing air, and arms of concrete."
 Former President Grover Cleveland reportedly nicknamed him "The Human Fly."
 When he visited Logan, West Virginia in January of 1927, the " Logan Banner " described him as a "boyish-looking man of 57 years."
 Gardiner reportedly moved to Europe after New York enacted legislation forbidding anyone from climbing on the outside of buildings.
 Details surrounding his death are unknown, but a person matching his description was found beaten to death at the base of the Eiffel Tower in 1933.
Cyrtophora citricola, also known as the Tropical Tent-Web Spider, is an araneid spider that occurs in the warmer parts of Europe, Asia and Africa, but also Australia, Costa Rica, Hispaniola and Colombia.
 It can now also be found in other parts, such as Florida, where it was first found in 2000.
The Leatherman (ca. 1839–1889) was a particular vagabond, famous for his handmade leather suit of clothes, who traveled a circuit between the Connecticut River and the Hudson River, roughly from 1857 to 1889.
 Of unknown origin, he was thought to be French-Canadian, because of his fluency in the French language, his "broken English", and the French-language prayer book found on his person after his death.
 His identity remains unknown, and controversial.
 He walked a 365-mile route year after year.
 His repeating route took him between towns arriving in a new town every 34–36 days in western Connecticut and eastern New York.
The white-necked heron, formerly known as the Pacific heron ("Ardea pacifica"), is a species of heron that is found on most of the Australian continent wherever freshwater habitats exist.
 It is also found in parts of Indonesia, New Guinea and New Zealand, but is uncommon in Tasmania.
 The populations of this species in Australia are known to be nomadic like most water birds in Australia, moving from one water source to another often entering habitats they have not previously occupied.
 Taking advantage of flooding and heavy rain where the surplus of food allows them to breed and raise their young.
 Population explosions have been known when the environmental conditions are right for this species in places where they have been rare or unknown.