The Blue whale (Balaenoptera musculus) is a marine mammal and a baleen whale. It is the largest animal known to have ever existed. The Blue whale was once abundant in nearly all the Earth's oceans until the end of the 19th century. It was hunted...
The Fin whale (Balaenoptera physalus) is a cetacean belonging to the parvorder of baleen whales. It is the second-longest species of cetacean on Earth after the Blue whale. American naturalist Roy Chapman Andrews called the fin whale "the greyhound...
The Sei whale (Balaenoptera borealis) is a baleen whale, the third-largest rorqual after the Blue whale and the Fin whale. It inhabits most oceans and adjoining seas and prefers deep offshore waters. The whale's name comes from the Norwegian word...
The Andean mountain cat (Leopardus jacobita) is a small wild cat native to the high Andes. It is regarded as one of the world’s most endangered wild cats and perhaps South America’s rarest felid, yet, as far as cat species go, it is amongst the...
The Marine otter (Lontra felina) is a rare and relatively unknown South American mammal. It is the smallest of the New World otters and the smallest marine mammal. This charismatic marine species displays charm and dexterity. It lives along South...
The Chacoan peccary or tagua (Catagonus wagneri or Parachoerus wagneri ) is the last extant species of the genus Catagonus ; it is a peccary found in the Gran Chaco of Paraguay, Bolivia, and Argentina. Approximately 3,000 remain in the world. It is...
The south Andean deer (Hippocamelus bisulcus ) is an endangered species of deer native to the mountains of Argentina and Chile. Along with the northern guemal or taruca, it is one of the two mid-sized deer in the Hippocamelus genus and ranges across...
The grey-headed albatross (Thalassarche chrysostoma ) also known as the grey-headed mollymawk, is a large seabird from the albatross family. It has a circumpolar distribution, nesting on isolated islands in the Southern Ocean and feeding at high...
Darwin's frog (Rhinoderma darwinii ), also called the southern Darwin's frog, is a rhinodermatid frog native to the forest streams of Chile and Argentina. It was first described by the French zoologist André Marie Constant Duméril and his assistant...
The tapeti (Sylvilagus brasiliensis ) is a species of cottontail rabbit. As traditionally defined, its range extends from southern Mexico to northern Argentina, but this includes several distinctive population that have since been split into...
The black rail (Laterallus jamaicensis ) is a mouse-sized member of the bird family Rallidae.
The Atlantic yellow-nosed albatross (Thalassarche chlororhynchos ) is a large seabird in the albatross family. The scientific name is from Ancient Greek. Thalassarche is from thalassa, "sea" and arkhe, "command", and chlororhynchos is from khloros,...
The northern royal albatross or toroa, Diomedea sanfordi, is a large seabird in the albatross family. It was split from the closely related southern royal albatross as recently as 1998, though not all scientists support that conclusion and some...
The Tristan albatross (Diomedea dabbenena ) is a large seabird from the albatross family. One of the great albatrosses of the genus Diomedea, it was only widely recognised as a full species in 1998.
The southern river otter (Lontra provocax ) is a species of otter that lives in Chile and Argentina. Although called a "river otter", it inhabits both marine and freshwater environments. It sometimes is considered a subspecies of Lontra canadensis....
The sooty albatross, dark-mantled sooty albatross or dark-mantled albatross, (Phoebetria fusca ), is a species of bird in the albatross family. They breed on sub-Antarctic islands and range at sea across the Southern Ocean from South America to...
The black-and-chestnut eagle (Spizaetus isidori ) is a South American species of bird of prey in the family Accipitridae. It is sometimes called Isidor's eagle. It is often placed in the monotypic genus Oroaetus. However, recent genetic testing...
The Chaco eagle (Buteogallus coronatus ) or crowned solitary eagle, is an endangered bird of prey from eastern and central South America. Typically it is known simply as the crowned eagle which leads to potential confusion with the African...
The hooded grebe (Podiceps gallardoi ), is a medium-sized grebe found in the southern region of Argentina. It grows to about 32 cm (13 in) in length, and is black and white in color. It is found in isolated lakes in the most remote parts of...
The Brazilian merganser (Mergus octosetaceus ) is a South American diving duck in the Mergus genus.It is one of the six most threatened waterfowl in the world, with possibly fewer than 250 birds in the wild and a few kept in captivity in Brazil. The...
The vinaceous-breasted amazon (Amazona vinacea ) is a species of parrot in the family Psittacidae. It is found in Argentina, Brazil, and Paraguay.Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist...
The Atlantic petrel (Pterodroma incerta ) is a gadfly petrel endemic to the South Atlantic Ocean. It breeds in enormous colonies on Tristan da Cunha and Gough Island, and ranges at sea from Brazil to Namibia, with most records at sea being to the...
The black-fronted piping guan or jacutinga in Brazilian Portuguese (Pipile jacutinga ) is a bird in the chachalaca, guan, and curassow family Cracidae. It is found in Argentina, Brazil, and Paraguay.
The purple-winged ground dove (Paraclaravis geoffroyi ) is a critically endangered species of dove, native to the Atlantic forest, mainly near bamboo, in south-eastern Brazil, far eastern Paraguay, and northern-eastern Argentina (Misiones only). It...
The fossorial giant rat (Gyldenstolpia fronto ) is a species of rodent in the family Cricetidae. It is found in Argentina and Brazil but was determined extinct following a recent assessment of the conservation status of Sigmodontine rodents. Its...
The golden viscacha rat or golden vizcacha rat (Pipanacoctomys aureus ) is the single species of the genus Pipanacoctomys of the rodent family Octodontidae. It has 92 chromosomes and has been regarded as tetraploid (4x = 2n). This octodontid and its...
The saffron-cowled blackbird (Xanthopsar flavus ) is a species of bird in the family Icteridae, in the monotypic genus Xanthopsar.It is found in Argentina, Brazil, Paraguay, and Uruguay (where it is found at the Quebrada de los Cuervos).Its natural...
The social tuco-tuco (Ctenomys sociabilis ) is a species of rodent in the family Ctenomyidae.It is endemic to Argentina.Its natural habitat is subtropical or tropical dry lowland grassland.
The mottled tuco-tuco (Ctenomys latro ) is a species of rodent in the family Ctenomyidae.It is endemic to Argentina.Its natural habitat is subtropical or tropical dry lowland grassland.
The marsh seedeater (Sporophila palustris ) is a species of bird in the family Thraupidae. It is sexually dichromic, with the males sporting a bright white throat, grey crown and chestnut belly, and the females resembling other brown female...
The Mendoza tuco-tuco (Ctenomys mendocinus ) is a species of rodent in the family Ctenomyidae.
The Chaco side-necked turtle or Chaco sideneck turtle (Acanthochelys pallidipectoris ) is a species of turtle in the family Chelidae.It is found in Argentina, Paraguay, and possibly Bolivia.Its natural habitat is subtropical or tropical moist...
The southern tuco-tuco (Ctenomys australis ) is a species of rodent in the family Ctenomyidae. It is endemic to Argentina.
Reig's tuco-tuco (Ctenomys osvaldoreigi ) is a species of rodent in the family Ctenomyidae. It is endemic to central Argentina, where it is known only from a grassland location in Cordoba Province at an elevation above 2000 m in the Sierras Grandes....
Nyctimantis is a genus of frogs in the family Hylidae. The genus is found in south-eastern Brazil as well as in the Orinoco Basin in Venezuela, Colombia, and Brazil. These are tree-dwelling species usually hiding in the cisterns of epiphytic...
Roig's tuco-tuco (Ctenomys roigi ) is a species of rodent in the family Ctenomyidae. It is endemic to a small region near the Paraná River in Corrientes Province, northeastern Argentina, where lives on sand dunes, and near rivers. Development is...
The Rio Negro tuco-tuco (Ctenomys rionegrensis ) is a species of rodent in the family Ctenomyidae. It is found in a small fragmented range in Entre Ríos Province in northeastern Argentina and in the Río Negro Department of western Uruguay. It is...
Pundt's tuco-tuco (Ctenomys pundti ) is a species of rodent in the family Ctenomyidae. It is endemic to the Pampas of southern Córdoba and San Luis Provinces in central Argentina. The species is named after Argentine landowner and collector Moritz...
Berg's tuco-tuco (Ctenomys bergi ) is a species of rodent in the family Ctenomyidae, named after the Latvian-Argentine biologist Frederico Guillermo Carlos Berg. It is endemic to northwestern Córdoba Province in central Argentina. Its habitat is...
Bonetto's tuco-tuco (Ctenomys bonettoi ) is a species of rodent in the family Ctenomyidae. It is endemic to Argentina.
The Chalchalero viscacha rat or Chalchalero vizcacha rat (Tympanoctomys loschalchalerosorum ) is a species of caviomorph rodent in the family Octodontidae. It was formerly considered to be monotypic within the genus Salinoctomys, but has been shown...
The Ibera seedeater (Sporophila iberaensis ) is a species of bird in the family Thraupidae, formerly included within the family of American sparrows (Emberizidae).It is found in the Iberá Wetlands. It was described in 2016.
