Brazil contains approximately 20 percent of Earth's biological diversity across six distinct biomes. The country holds formal protected status over roughly 2.47 million square kilometers through federal conservation units, state parks, and indigenous territories that function as de facto wildlife reserves. The Instituto Chico Mendes de Conservação da Biodiversidade, established in 2007, manages 335 federal protected areas covering approximately 950,000 square kilometers. Indigenous lands administered by Fundação Nacional dos Povos Indígenas span an additional 1.17 million square kilometers, concentrated in Amazonas state where they comprise 28 percent of total land area. These territories demonstrate measurably lower deforestation rates than surrounding regions—satellite data from Instituto Nacional de Pesquisas Espaciais shows indigenous lands experienced 1.6 percent forest loss between 2000 and 2019 compared to 8.1 percent in comparable non-protected areas.
The Amazon Rainforest biome covers 4.2 million square kilometers of Brazilian territory across nine states. This region supports an estimated 40,000 plant species, 1,300 bird species, 3,000 fish species, and 430 mammal species according to catalogs maintained by Instituto Nacional de Pesquisas da Amazônia. Jaú National Park, gazetted in 1980, protects 2.27 million hectares of continuous lowland forest in Amazonas state—the largest forest reserve in South America. The park contains entire watersheds of the Jaú, Carabinani, and Unini rivers where populations of Amazonian manatee, giant river otter, black caiman, and boto river dolphins persist without dams or commercial navigation. Anavilhanas Archipelago, designated a national park in 2008, encompasses approximately 400 river islands formed by the Negro River covering 350,018 hectares. Water level fluctuations reach 15 meters between dry and wet seasons, creating flooded forests that support pirarucu fish exceeding three meters in length and weighing over 200 kilograms.
Tumucumaque Mountains National Park, created in 2002, protects 3.85 million hectares along the border with French Guiana and Suriname—the largest tropical forest park on Earth. The region remains 99 percent forested with no permanent human settlements. Camera trap surveys conducted between 2016 and 2018 documented jaguar, puma, lowland tapir, giant armadillo, and eight primate species including northern bearded saki and Guianan red howler monkey. The park contains headwaters of rivers draining north to the Amazon and south to tributaries of the Jari River. Araguaia National Park on Bananal Island in Tocantins state covers 562,312 hectares of seasonally flooded grasslands where transitions between Amazon forest and Cerrado savanna create ecotone habitats. The park supports Brazil's largest remaining population of Araguaian river dolphin, recognized as a distinct species from boto in 2014 based on skull morphology and genetic sequencing.
The Pantanal wetland spans 150,000 square kilometers across Mato Grosso and Mato Grosso do Sul states—the world's largest tropical wetland system. Seasonal flooding inundates up to 80 percent of the region between November and March when Paraguay River levels rise four to five meters. Wildlife concentrations during dry season receding waters create observed densities of 12 jaguars per 100 square kilometers in the northern Pantanal, documented through GPS collar studies by Panthera organization between 2014 and 2020. The region supports approximately 10 million caimans, primarily yacare caiman and smaller numbers of broad-snouted caiman. Hyacinth macaw populations, reduced to an estimated 1,500 individuals by 1990 due to pet trade capture, have recovered to approximately 6,500 birds according to Instituto Arara Azul surveys conducted in 2020. The species nests exclusively in cavities of manduvi trees, with 85 percent of documented nests occurring in this single tree species.
Atlantic Forest originally covered 1.3 million square kilometers along Brazil's coast from Rio Grande do Norte to Rio Grande do Sul. Current forest cover totals approximately 160,000 square kilometers—12.4 percent of original extent distributed across more than 245,000 fragments. Despite this reduction, the biome supports 20,000 plant species with 8,000 found nowhere else, and 298 mammal species including 90 endemic species. Golden lion tamarin populations fell to approximately 200 individuals in 1970s when habitat in Rio de Janeiro state had declined to two percent of historical range. Captive breeding programs initiated in 1972 and forest corridor restoration resulted in wild populations reaching 3,700 individuals by 2014 according to Associação Mico-Leão-Dourado census data. The species occupies protected areas including Poço das Antas Biological Reserve and União Biological Reserve, both in Rio de Janeiro state.
Serra do Mar coastal mountain range extends 1,500 kilometers from Rio de Janeiro to Santa Catarina, with elevations reaching 2,245 meters at Pico Paraná. Continuous Atlantic Forest cover persists across 1.2 million hectares protected within Serra do Mar State Park in São Paulo—Brazil's largest state park unit. The park contains populations of southern muriqui, the largest New World primate, which numbered approximately 1,300 individuals across its entire range according to 2015 surveys. Black-faced lion tamarin, endemic to São Paulo interior forests, exists in fewer than 400 individuals concentrated in Morro do Diabo State Park and adjacent private reserves. Vinaceous-breasted amazon parrot populations declined to critically endangered status by 2000 with fewer than 2,500 individuals remaining in fragmented Atlantic Forest of Paraná, Santa Catarina, and Rio Grande do Sul states.
Iguaçu National Park protects 185,262 hectares of Atlantic Forest along the border with Argentina, established in 1939. The park contains Iguazu Falls and supports approximately 40 mammal species including jaguar, puma, ocelot, and South American tapir. Black-fronted piping guan, endemic to Atlantic Forest, maintains breeding populations within the park. Five-species toucan assemblages occur in intact forest sectors—toco toucan, red-breasted toucan, channel-billed toucan, saffron toucanet, and spot-billed toucanet coexist through dietary partitioning and seasonal fruit availability differences. The park recorded 257 bird species during systematic surveys between 1980 and 1982.
Itatiaia National Park, created in 1937 as Brazil's first national park, covers 30,000 hectares across Rio de Janeiro and Minas Gerais states at elevations from 540 to 2,791 meters. High-altitude grasslands above 2,200 meters support plant species adapted to nightly frosts including Senecio species occurring only in southeastern Brazilian mountaintops. The park protects watersheds feeding Paraíba do Sul River basin. Brown howler monkeys, buffy-tufted marmosets, and black-horned capuchin monkeys occupy mid-elevation forests. The threatened three-toed sloth reaches its southern distribution limit in Itatiaia forests.
Fernando de Noronha archipelago lies 350 kilometers off the coast of Pernambuco state. The marine national park, created in 1988, covers 11,270 hectares including oceanic waters to 50-meter depth surrounding 21 islands. Spinner dolphins maintain a resident population of approximately 1,200 individuals that enter protected bays during daylight hours. Green sea turtles nest on beaches between December and July, with Atalaia Beach and Leão Beach recording 200 to 400 nests annually. Hawksbill turtles nest in smaller numbers—10 to 30 nests per season documented between 2007 and 2018. The archipelago supports Brazil's only insular population of the endemic Noronha vireo, a bird species occurring nowhere else on Earth with total population estimated at 1,500 individuals in 2016 surveys.
Abrolhos Marine National Park, established in 1983, protects 91,300 hectares of ocean and reef formations 70 kilometers off the coast of Bahia state. The park contains the Southern Atlantic's largest coral reef complex and the only place where chapeirões—mushroom-shaped coral pinnacles rising 25 meters from the seafloor—occur naturally. Humpback whale populations migrate from Antarctic feeding grounds to Abrolhos between July and November for breeding. The breeding stock increased from an estimated 450 individuals in 1981 to approximately 25,000 in 2016 according to Instituto Baleia Jubarte aerial survey data. Peak presence occurs in September when observers document 120 to 180 individual whales in park waters on single survey flights.
The Cerrado savanna biome covers 2 million square kilometers across central Brazil—approximately 21 percent of national territory. Vegetation consists of grasslands interspersed with scattered trees possessing thick corky bark and deep root systems extending 15 to 20 meters to access water during dry seasons lasting five to six months. The biome supports approximately 12,000 plant species with 4,400 endemic. Chapada dos Veadeiros National Park in Goiás state protects 240,611 hectares of Cerrado plateau at elevations between 600 and 1,650 meters. The park contains populations of maned wolf, giant anteater, giant armadillo, and pampas deer. Emas National Park on the Goiás-Mato Grosso do Sul border covers 132,941 hectares of flat Cerrado with termite mounds reaching three meters in height. Blue-and-yellow macaws nest in burrows excavated into these termite structures—the only documented ground-nesting behavior in large macaw species.
Caatinga semi-arid shrubland covers 844,453 square kilometers across northeastern states including Bahia, Ceará, Pernambuco, and Piauí. Annual rainfall ranges from 200 to 800 millimeters concentrated in three to four months, with some localities recording no rain for 12 consecutive months during drought years. Vegetation includes deciduous thorny shrubs that shed leaves during dry periods and cacti species. Serra da Capivara National Park in Piauí, designated in 1979, protects 129,140 hectares of Caatinga canyons and rock formations containing 30,000 prehistoric rock art images dated between 25,000 and 6,000 years before present. The park supports populations of white-lipped peccary, collared peccary, and the last remaining pumas in Caatinga habitat. Lear's macaw, endemic to Bahia Caatinga, numbered only 60 individuals in 1983 when discovered nesting in sandstone cliff crevices. Population recovery through protected nesting sites reached 1,700 birds by 2018 according to Instituto Chico Mendes surveys.
Lençóis Maranhenses National Park protects 155,000 hectares of coastal sand dunes in Maranhão state. Freshwater lagoons form between dune ridges during January to June rainy season when 1,600 millimeters of rain accumulates in depressions. These temporary pools reach depths of three meters and support fish populations of annual killifish species that complete entire life cycles during four-month inundation periods. Eggs remain dormant in damp sand during eight-month dry season. The park contains nesting sites for threatened coastal species including scarlet ibis and roseate spoonbill in mangrove transition zones.
Brazil's jaguar population totals between 64,000 and 170,000 individuals according to 2016 assessment by Instituto Chico Mendes combining camera trap density estimates with habitat modeling. The Pantanal supports the densest populations at 6.6 to 12 individuals per 100 square kilometers. Amazon populations occur at lower densities of 2 to 5 individuals per 100 square kilometers across larger continuous forest. Atlantic Forest populations persist in fragmented subpopulations with only six areas supporting more than 50 individuals—the minimum viable population size identified in genetic studies. Iguaçu National Park and contiguous Argentine park protect approximately 250 jaguars in the largest Atlantic Forest population.
Giant otter populations, reduced to critically endangered status by 1970s fur trade, now number approximately 5,000 individuals concentrated in protected areas across Amazon basin and Pantanal. Family groups of 5 to 9 individuals defend territories of 12 to 32 kilometers of river or lake shoreline. Jaú National Park supports an estimated 150 individuals in approximately 30 family groups. The species consumes 3 to 4 kilograms of fish daily per individual, with diet consisting primarily of characins and catfish species between 10 and 30 centimeters in length.
Amazonian manatee populations occupy blackwater rivers and flooded forests throughout Amazon basin. The species reaches 2.8 meters in length and 450 kilograms in weight—smaller than West Indian manatee occurring in coastal waters of northern and northeastern states. Population estimates suggest 10,000 to 30,000 individuals across Brazilian Amazon based on limited survey data from Mamirauá Sustainable Development Reserve and other protected areas. Animals feed exclusively on aquatic vegetation consuming up to 8 percent of body weight daily. During low-water months from August to November, individuals reduce activity and fast for periods exceeding 200 days in isolated deep pools.
Lowland tapir populations occur in all Brazilian biomes except Caatinga. The largest surviving native terrestrial herbivore in South America reaches 300 kilograms and consumes 40 to 45 kilograms of browse daily. Camera trap studies in Iguaçu National Park documented 35 individuals across the protected area between 2008 and 2012. Pantanal populations face reduced habitat availability during peak flood months when animals concentrate on raised areas. Atlantic Forest populations persist only in largest protected fragments exceeding 10,000 hectares.
Giant armadillo inhabits Cerrado, Pantanal, and Amazon forest regions. The species reaches 1.5 meters in length and 60 kilograms in weight. Individuals excavate burrows 1.5 to 5 meters deep and 40 centimeters in diameter to access termite and ant colonies that constitute 95 percent of diet. A single giant armadillo consumes approximately 200,000 insects per night during foraging sessions lasting 8 to 12 hours. Emas National Park studies using GPS collars documented individual home ranges between 519 and 2,615 hectares with no overlap between adult animals of same sex.
Maned wolf, the tallest canid in South America at 90 centimeters shoulder height, occupies Cerrado grasslands and occasionally Pampas habitats in southern Brazil. The species is solitary with overlapping home ranges between mated pairs spanning 20 to 140 square kilometers depending on prey availability. Diet consists of 50 percent fruit—particularly lobeira fruit—and small mammals including pacas, armadillos, and rodents. Serra da Canastra National Park in Minas Gerais supports approximately 50 individuals based on scat transect surveys conducted in 2014.
Brazilian tapir populations in Atlantic Forest face genetic isolation in forest fragments. Studies of populations in Morro do Diabo State Park in São Paulo state detected genetic diversity 23 percent lower than Amazonian populations, indicating founder effects and genetic drift in isolated fragments. Minimum fragment size supporting viable tapir populations was calculated at 12,500 hectares through population modeling incorporating birth rates of 0.11 offspring per female per year and mortality rates.
Black caiman populations in Amazon basin rebounded from commercial hunting that reduced numbers to near extinction by 1970. Sustainable use reserves established in Amazonas state allow regulated harvest of adults exceeding 2.5 meters while protecting breeding populations. Mamirauá Sustainable Development Reserve censuses documented density increases from 4.9 to 23.7 caimans per kilometer of waterway between 1993 and 2002 following protection enforcement. Current population across Brazilian Amazon exceeds 1 million individuals with Mamirauá alone supporting approximately 500,000 caimans in 1.124 million hectares of protected várzea floodplain.
Leatherback sea turtles nest on beaches in Espírito Santo state between October and March. Comboios Biological Reserve, established in 1984, protects 833 hectares including primary nesting beaches where 120 to 180 females deposit eggs annually according to Tamar Project monitoring data. Loggerhead turtles nest primarily in Bahia state with Praia do Forte receiving 150 to 300 nesting females per season. Hawksbill turtles nest in smaller numbers across northeastern states with total Brazilian nesting population estimated at 150 females. Olive ridley and green turtles nest on oceanic islands—Fernando de Noronha and Trindade Island respectively.