The Pantanal cat ("Leopardus colocola braccatus") is a Pampas cat subspecies, a small wild cat native to South America.
 It is named after the Pantanal wetlands in central South America, where it inhabits mainly grassland, shrubland, savannas and deciduous forests.
The Machapunga were a small Native American tribe of the Algonquian language family, one of a number in the territory of North Carolina.
 Previously they were known under the name Secotan.
 They were a group who had migrated south from the Algonquian peoples of the Powhatan Confederacy in present-day Virginia.
 They are now extinct as a separate tribe.
 They spoke an Algonquian language and historically occupied a coastal area of northeastern North Carolina.
This is a list of the native wild mammal species recorded in South America.
 South America's terrestrial mammals fall into three distinct groups.
 The marsupials and xenarthrans are 'old-timers', their ancestors having been present on the continent since at least the very early Cenozoic Era.
 During the early Cenozoic, South America's only land connection was to Antarctica, so it was effectively cut off from most of the world; as the fragments of Gondwana continued to separate, this connection was lost, leaving South America an island continent.
 Caviomorph rodents and monkeys arrived as 'waif dispersers' by rafting across the Atlantic from Africa in the Eocene epoch, 35 million or more years ago.
 All the remaining nonflying mammals of South America are recent arrivals, having migrated from North America via Central America during the past seven million years as part of the Great American Interchange; this invasion, which peaked around three million years ago, was made possible when the formation of the volcanic Isthmus of Panama bridged North and South America.
 The newcomers out-competed and drove to extinction many unique mammals that had evolved during South America's long period of isolation, as well as some species from other classes (e.g., terror birds).
The history of the Native Americans in Baltimore and what is now Baltimore dates back at least 12,000 years.
 As of 2014, Baltimore is home to a small Native American population centered in East Baltimore.
 The majority of the Native Americans now living in Baltimore belong to the Lumbee, Piscataway, and Cherokee tribes.
 The Piscataway tribe is indigenous to Southern Maryland, living in the area for centuries prior to European colonization.
 The Lumbee and Cherokee are indigenous to North Carolina and neighboring states of the Southeastern United States.
 Many of the Lumbee and Cherokee migrated to Baltimore during the mid-1900s along with other migrants from the South, such as African-Americans and white Appalachians.
Tylopilus nebulosus is a species of bolete fungus in the family Boletaceae found in eastern North America.
 It was originally described by Charles Horton Peck in 1898 as a species of "Boletus", from collections made in Ray Brook, New York.
 Carl B. Wolfe transferred it to the genus "Tylopilus" in 1980.
Eielson Peninsula ( ) is a rugged, mainly snow-covered peninsula, 20 nmi long in an east–west direction and averaging 10 nmi wide, lying between Smith Inlet and Lehrke Inlet on the east coast of Palmer Land.
 The rocky north wall of this peninsula is probably the feature which, on his flight of December 20, 1928, Sir Hubert Wilkins sighted and named "Cape Eielson" from a position above Stefansson Strait (Wilkins gave the name to the farthest south rock outcrop seen from this position).
 This rock wall is conspicuous in the aerial photographs of the peninsula taken by members of the United States Antarctic Service in 1940 from an aerial position at the north side of Stefansson Strait.
 The peninsula is named for Carl B. Eielson, the pilot on Wilkins' flight of 1928.
Austroboletus subflavidus is a species of bolete fungus in the family Boletaceae.
 It is found in eastern North America, where it fruits near oak and pine trees.
 Originally described as a species of "Tylopilus" by American mycologist William Murrill in 1938, it was transferred to the genus "Austroboletus" by Carl B. Wolfe in 1980.
 The fruit body has a white to yellowish convex to flattened cap measuring 3 – in diameter.
 The pores on the cap underside, which measure about 1 mm wide, are initially white to grayish before becoming pinkish.
 The coarsely reticulate and pitted stipe measures 4.5 – long by 0.7 – .
 The spore print is reddish brown; spores are spindle-shaped (fusoid) with dimensions of 15–20 by 6–9 μm.
Carl Buckingham Koford (September 3, 1915 in Oakland, California – December 3, 1979 in Berkeley, California) was an American biologist who is known for his research work on the behavior of the California condor.
 He attended the Piedmont High School and studied at the University of Washington.
 Koford began his field work about the California condor in March 1939.
 More than 400 days until June 1941 he spend with the condors.
 During World War II he interrupted his studies to serve in the U.S. Navy.
 In 1946 his observations on the condors continued.
 In 1953 he published the report "The California Condor" where he gave a first estimation of the world population of about 60 individuals.
 In the 1950s and again in the 1970s he went to South America where he made studies on species like the Vicuña, the Jaguar, the Ocelot or the Jaguarundi.
 After rumours about the survival of some individuals of the thought to be extinct Mexican grizzly bear Koford went to Mexico in 1969 but he failed to rediscover this bear.
The Coree (also Connamox, Cores, Corennines, Connamocksocks, Coranine Indians, Neuse River Indians) were a very small Native American tribe, who once occupied a coastal area south of the Neuse River in southeastern North Carolina in the area now covered by Carteret and Craven counties.
 Early 20th-century scholars were unsure of what language they spoke, but the coastal areas were mostly populated by Iroquois and Algonquian peoples.
The jaguarundi ("Puma yagouaroundi") ( ) or eyra cat is a small wild cat native to southern North America and South America.
 It has been listed as Least Concern on the IUCN Red List since 2002.
 Its presence in Uruguay is uncertain.
 The megareserves of the Amazon Basin are probably the only conservation units that can sustain long-term viable populations.

Question: What Small native cat to North and South America did Carl B. Koford make studies on in the 50's and 70's?
Answer: Jaguarundi