Question: What mythology belongs to the indigenous people in the Patagonian region of southern Argentina and Chile, who are also known as the Onawo or Ona?

Context paragraphs:
Selk'nam mythology: Selk'nam mythology is the body of myths of the Selk'nam and Haush people, Tierra del Fuego.

Patagonian Desert: The Patagonian Desert, also known as the Patagonia Desert, Patagonian Steppe, or Magellanic Steppe, is the largest desert in Argentina and is the 8th largest desert in the world by area, occupying 673,000 square kilometers (260,000 mi).  It is located primarily in Argentina with small parts in Chile and is bounded by the Andes, to its west, and the Atlantic Ocean to its east, in the region of Patagonia, southern Argentina.  To the north the desert grades into the Cuyo Region and the Pampas.  The central parts of the steppe are dominated by shrubby and herbaceous plant species albeit to the west, where precipitation is higher, bushes are replaced by grasses.  Topographically the deserts consist of alternating tablelands and massifs dissected by river valleys and canyons.  The more western parts of the steppe host lakes of glacial origin and grades into barren mountains or cold temperate forests along valleys.

Nannophryne variegata: Nannophryne variegata, known also as the Eden Harbour toad or Patagonian toad, is a species of toad in the family Bufonidae.  It is found in southern Argentina (from Neuquén southwards) and Chile.  There is also a record from Peru, but this requires confirmation given its great geographic and ecological isolation.  It occurs in Tierra del Fuego south to 53°S, making it the southernmost amphibian in the world, a record shared with "Batrachyla antartandica".

Cerro Toro: Cerro Toro is a Cretaceous landform of the Magallanes Foreland the Patagonian region of southeastern Chile.  The Cerro Toro is an element of the southern Andes Mountain Range.  The Andes are the result of plate tectonics processes, caused by the subduction of the Nazca Plate beneath the South American plate.  The formation of the Cerro Toro began in the Jurassic Period.  The Cueva del Milodón Natural Monument is situated on the southern flank of Cerro Benitez associated with the Cerro Toro formation.

Eberhard Fjord: Eberhard Fjord is an arm of Seno Ultima Esperanza in the Patagonian region of Chile.  This surface water body was named after Hermann Eberhard, the first European to explore this region.  Eberhard used the fjord to find the Cueva del Milodón, where he discovered remains of the extinct Giant sloth; archaeological recovery of evidence of prehistoric man was also found at this cave complex.  Geologically this fjord is within the Magallanes Basin.

Selk'nam people: The Selk'nam, also known as the Onawo or Ona people, are an indigenous people in the Patagonian region of southern Argentina and Chile, including the Tierra del Fuego islands.  They were one of the last native groups in South America to be encountered by migrant ethnic Europeans or Westerners in the late 19th century.  With the discovery of gold and expansion of sheep farming, the Argentine and Chilean governments began efforts to explore, colonize and commit genocide against the indigenous peoples of Tierra del Fuego (the "land of fire", named by early European explorers observing smoke from Selk'nam fires) into their cultures.

Crested duck: The crested duck ("Lophonetta specularioides") is a species of duck native to South America, the belonging to the monotypic genus "Lophonetta".  It is sometimes included in "Anas", but it belongs to a South American clade that diverged early in dabbling duck evolution.  There are two subspecies: "L. specularioides alticola" (Andean crested duck) and "L. specularioides specularioides" (Patagonian crested duck).  The Patagonian crested duck is also called the southern crested duck and its range lies in the Falklands, Chile, and Argentina.

Cerro Benítez: Cerro Benítez ("Benítez hill") is a mountain in the Patagonian region of Chile.  In a larger context this feature is an element of the Cerro Toro geological complex.  The Cueva del Milodón Natural Monument is situated on the southern flank of Cerro Benítez.  The Cerro Benítez is a location for sighting of the Andean condor.

Thomas Bridges (Anglican missionary): Thomas Bridges (ca. 1842–1898) was an Anglican missionary and linguist, the first to set up a successful mission to the indigenous peoples in Tierra del Fuego, Argentina.  Adopted and raised in England by George Pakenham Despard, he accompanied his father to Argentina with the Patagonian Missionary Society.  After an attack by indigenous people, in 1869 Despard left the mission at Keppel Island to return with his family to England.  At the age of 17, Bridges stayed with the mission as its new superintendent.  In the late 1860s, he worked to set up a mission at what is now the town of Ushuaia.

Tectonic evolution of Patagonia: Patagonia comprises the southernmost region of South America, portions of which lie either side of the Chile–Argentina border.  It has traditionally been described as the region south of the Rio Colorado, although the physiographic border has more recently been moved southward to the Huincul fault.  The region's geologic border to the north is composed of the Rio de la Plata craton and several accreted terranes comprising the La Pampa province.  The underlying basement rocks of the Patagonian region can be subdivided into two large massifs: the North Patagonian Massif and the Deseado Massif.  These massifs are surrounded by sedimentary basins formed in the Mesozoic that underwent subsequent deformation during the Andean orogeny.

Supporting paragraphs: Selk'nam mythology Selk'nam people
Answer: The Selk'nam