Question: What island is the only home to the snake commonly known as The Golden Lancehead?

Documents:
source: Ilha da Queimada Grande
text: Ilha da Queimada Grande Ilha da Queimada Grande, also known as Snake Island, one of many Snake Islands around the world, is an island off the coast of Brazil in the Atlantic Ocean. It is administered as part of the municipality of Itanhaém in the State of São Paulo. The island is small in size and has many different types of terrain, ranging from bare rock to rainforest. The island has a temperate climate. The island is the only home of the critically endangered, venomous "Bothrops insularis" (golden lancehead pit viper), which has a diet of birds. The snakes became trapped on the island when rising sea levels covered up the land that connected it to the mainland. This left the snakes to adapt to their environment, increase rapidly in population and render the island dangerous to public visitation. Queimada Grande is closed to the public in order to protect this snake population; access is only available to the Brazilian Navy and selected researchers vetted by the Chico Mendes Institute for Biodiversity Conservation, the Brazilian federal conservation unit.

source: Bothrops insularis
text: Bothrops insularis Bothrops insularis, commonly known as the golden lancehead, is a venomous pit viper species endemic to Ilha da Queimada Grande, off the coast of São Paulo state, in Brazil. The species is named for the light yellowish-brown color of its underside and for its head shape which is characteristic of the genus "Bothrops." No subspecies of "Bothrops insularis" are currently recognized.

source: Bothrops pictus
text: Bothrops pictus Bothrops pictus, commonly known in English as the desert lancehead, is a species of venomous snake in the family Viperidae. The species is endemic to South America.

source: Bothrops leucurus
text: Bothrops leucurus Bothrops leucurus, commonly known as the whitetail lancehead or the Bahia lancehead, is a venomous pit viper species endemic to Brazil. No subspecies are currently recognized.

source: Opheodrys aestivus
text: Opheodrys aestivus Opheodrys aestivus, commonly known as the rough green snake, is a nonvenomous North American colubrid. It is sometimes called grass snake or green grass snake, but these names are more commonly applied to the smooth green snake ("Opheodrys vernalis"). The European colubrid called grass snake ("Natrix natrix") is unrelated. The rough green snake is docile, often allowing close approach by humans, and seldom bites. Even when bites occur, they have no venom and are harmless.

source: Hydrophis semperi
text: Hydrophis semperi Hydrophis semperi, commonly known as Garman's sea snake, the Lake Taal snake, or the Philippine freshwater sea snake, is a rare species of venomous sea snake found only in a single lake on the island of Luzon in the Philippines. It is noted for being one of two known species of sea snakes (and the only one in its family) that is known to be found almost-exclusively in freshwater. The other freshwater sea snake species is "Laticauda crockeri.

source: Paranaja
text: Paranaja Paranaja multifasciata or Naja multifasciata is a species of venomous elapid snake commonly known as the many-banded snake or burrowing cobra. The species is found in the Republic of Congo, the Democratic Republic of Congo and Cameroon in Africa.

source: Bothrops moojeni
text: Bothrops moojeni Bothrops moojeni, commonly known in English as the Brazilian lancehead, is a species of venomous snake in the family Viperidae. It is a pit viper endemic to South America.

source: Bothrops erythromelas
text: Bothrops erythromelas Bothrops erythromelas, commonly known as the Caatinga lancehead or the jararaca-da-seca, is a species of venomous snake in the family Viperidae. It is endemic to Brazil. It belongs to reptile class.

source: Cemophora
text: Cemophora Cemophora coccinea is a nonvenomous species of colubrid snake commonly known as the scarlet snake. It is the only member of its genus. They are native to the southeastern United States. There are three subspecies of "C. coccinea".

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Answer: Ilha da Queimada Grande