Question: When do purple martins migrate to the continent where the largest country holds a football tournament?

full_context: Document 1: Bird migration: The typical image of migration is of northern landbirds, such as swallows (Hirundinidae) and birds of prey, making long flights to the tropics. However, many Holarctic wildfowl and finch (Fringillidae) species winter in the North Temperate Zone, in regions with milder winters than their summer breeding grounds. For example, the pink-footed goose Anser brachyrhynchus migrates from Iceland to Britain and neighbouring countries, whilst the dark-eyed junco Junco hyemalis migrates from subarctic and arctic climates to the contiguous United States and the American goldfinch from taiga to wintering grounds extending from the American South northwestward to Western Oregon. Migratory routes and wintering grounds are traditional and learned by young during their first migration with their parents. Some ducks, such as the garganey Anas querquedula, move completely or partially into the tropics. The European pied flycatcher Ficedula hypoleuca also follows this migratory trend, breeding in Asia and Europe and wintering in Africa.
Document 2: 1986 FIFA World Cup: The 1986 FIFA World Cup, the 13th FIFA World Cup, was held in Mexico from 31 May to 29 June 1986. The tournament was the second to feature a 24-team format. With European nations not allowed to host after the previous World Cup in Spain, Colombia had been originally chosen to host the competition by FIFA but, largely due to economic reasons, was not able to do so and officially resigned in 1982. Mexico was selected as the new host in May 1983, thus becoming the first country to host the World Cup more than once. This was the third FIFA World Cup tournament in succession that was hosted by a Spanish-speaking country, after Argentina 1978, and Spain 1982.
Document 3: 2019 Copa América: The 2019 Copa América will be the 46th edition of the Copa América, the quadrennial international men's football championship organized by South America's football ruling body CONMEBOL. It will be held in Brazil. The winner of the tournament will earn the right to compete for the 2021 FIFA Confederations Cup. Chile will be the defending champions.
Document 4: Geography of Brazil: The country of Brazil occupies roughly half of South America, bordering the Atlantic Ocean. Brazil covers a total area of 8,514,215 km (3,287,357 sq mi) which includes 8,456,510 km (3,265,080 sq mi) of land and 55,455 km (21,411 sq mi) of water. The highest point in Brazil is Pico da Neblina at 2,994 m (9,823 ft). Brazil is bordered by the countries of Argentina, Bolivia, Colombia, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela, and France (overseas department of France, French Guiana).
Document 5: Languages of Brazil: Portuguese is the official language of Brazil, and is widely spoken by most of population. Brazilian Sign Language is also an official language. Minority languages include indigenous languages and languages of more recent European and Asian immigrants. The population speaks or signs approximately 210 languages, of which 180 are indigenous. Less than forty thousand people actually speak any one of the indigenous languages in the Brazilian territory.
Document 6: José Antunes Sobrinho: Brasília (Portuguese pronunciation: [bɾaˈziljɐ]) is the federal capital of Brazil and seat of government of the Federal District. The city is located atop the Brazilian highlands in the country's center-western region. It was founded on April 21, 1960, to serve as the new national capital. Brasília and its metro (encompassing the whole of the Federal District) had a population of 2,556,149 in 2011, making it the 4th most populous city in Brazil. Among major Latin American cities, Brasília has the highest GDP per capita at R$61,915 (US$36,175).
Document 7: 1989 Copa América: The Copa América 1989 football tournament was hosted by Brazil, from 1 to 16 July. All ten CONMEBOL member nations participated.
Document 8: Purple martin: The purple martin migrates to the Amazon basin in winter. Its winter range extends into Ecuador but does not seem to ascend far up the Andean foothills.
Document 9: Bird migration: Within a species not all populations may be migratory; this is known as "partial migration". Partial migration is very common in the southern continents; in Australia, 44% of non-passerine birds and 32% of passerine species are partially migratory. In some species, the population at higher latitudes tends to be migratory and will often winter at lower latitude. The migrating birds bypass the latitudes where other populations may be sedentary, where suitable wintering habitats may already be occupied. This is an example of leap-frog migration. Many fully migratory species show leap-frog migration (birds that nest at higher latitudes spend the winter at lower latitudes), and many show the alternative, chain migration, where populations 'slide' more evenly north and south without reversing order.
Document 10: Purple martin: Wintering in South America, purple martins migrate to North America in spring to breed. Spring migration is somewhat staggered, with arrivals in southern areas such as Florida and Texas in January, but showing up in the northern United States in April and in Canada as late as May. Males usually arrive at a site before females.
Document 11: Bird migration: Many of the smaller insectivorous birds including the warblers, hummingbirds and flycatchers migrate large distances, usually at night. They land in the morning and may feed for a few days before resuming their migration. The birds are referred to as passage migrants in the regions where they occur for short durations between the origin and destination.
Document 12: 2018 FIFA World Cup qualification (CONMEBOL): 2018 FIFA World Cup qualification (CONMEBOL) Tournament details Dates 8 October 2015 -- 10 October 2017 Teams 10 (from 1 confederation) Tournament statistics Matches played 90 Goals scored 242 (2.69 per match) Attendance 3,365,010 (37,389 per match) Top scorer (s) Edinson Cavani (10 goals) ← 2014 2022 →
Document 13: South America: Brazil is the largest country in South America, encompassing around half of the continent's land area and population. The remaining countries and territories are divided among three regions: The Andean States, the Guianas and the Southern Cone.
Document 14: Brazil: Brazil (Portuguese: Brasil Portuguese pronunciation: (bɾaˈziw)), officially the Federative Republic of Brazil (Portuguese: República Federativa do Brasil, listen (help info)), is the largest country in both South America and Latin America. At 8.5 million square kilometers (3.2 million square miles) and with over 208 million people, Brazil is the world's fifth - largest country by area and the sixth most populous. The capital is Brasília, and the most populated city is São Paulo. The federation is composed of the union of the 26 states, the Federal District, and the 5,570 municipalities. It is the largest country to have Portuguese as an official language and the only one in the Americas; it is also one of the most multicultural and ethnically diverse nations, due to over a century of mass immigration from around the world.
Document 15: 1990 FIFA World Cup: 1990 FIFA World Cup Coppa del Mondo FIFA Italia '90 1990 FIFA World Cup official logo Tournament details Host country Italy Dates 8 June -- 8 July (31 days) Teams 24 (from 5 confederations) Venue (s) 12 (in 12 host cities) Final positions Champions West Germany (3rd title) Runners - up Argentina Third place Italy Fourth place England Tournament statistics Matches played 52 Goals scored 115 (2.21 per match) Attendance 2,516,215 (48,389 per match) Top scorer (s) Salvatore Schillaci (6 goals) Best player Salvatore Schillaci Best young player Robert Prosinečki Fair play award England ← 1986 1994 →
ground_truth: winter
sub_queries: Where was the football tournament held? Answer: Brazil,
Brazil, is the largest country on which continent Answer: South America
when do purple martins migrate to South America Answer: winter