<P> This species is largely silent away from the nest . There, the adults give a penetrating, weak, melancholy scream, with the incubating males' call described as "whispy screaming or wailing". The females' calls while incubating are similar, but are lower - pitched . While approaching the nest with food, the male calls out "rapid chirps, goose - like calls, and occasional sharp screams". Vocalization in both parents decreases as the nestlings age, while the nestlings become more vocal . The nestlings call chi - chi - chi...chi - chi - chi - chi, seemingly in alarm in response to rain or direct sunlight . When humans approach the nest, the nestlings have been described as uttering croaks, quacks, and whistles . </P> <P> Rare throughout its range, the harpy eagle is found from Mexico (almost extinct), through Central America and into South America to as far south as Argentina . The eagle is most common in Brazil, where it is found across the entire national territory . With the exception of some areas of Panama, the species is almost extinct in Central America, subsequent to the logging of much of the rainforest there . The harpy eagle inhabits tropical lowland rainforests and may occur within such areas from the canopy to the emergent vegetation . They typically occur below an elevation of 900 m (3,000 ft), but have been recorded at elevations up to 2,000 m (6,600 ft). Within the rainforest, they hunt in the canopy or sometimes on the ground, and perch on emergent trees looking for prey . They do not generally occur in disturbed areas, but regularly visit semiopen forest / pasture mosaic, mainly in hunting forays . Harpies, however, can be found flying over forest borders in a variety of habitats, such as cerrados, caatingas, buriti palm stands, cultivated fields, and cities . They have been found in areas where high - grade forestry is practiced . </P> <P> Adults are near the top of a food chain and are rarely preyed on . However, individuals are known to have been taken by jaguars and the much smaller ocelot Its main prey are tree - dwelling mammals and a majority of the diet has been shown to focus on sloths and monkeys . Research conducted by Aguiar - Silva between 2003 and 2005 in a nesting site in Parintins, Amazonas, Brazil, collected remains from prey offered to the nestling by its parents and after sorting them, concluded, in terms of individuals preyed upon, the harpy's prey basis was composed in 79% by sloths from two species: Bradypus variegatus amounting to 39% of the individual prey base, and Choloepus didactylus to 40%; various monkeys amounted to 11.6% of the same prey base . In a similar research venture in Panama, where a couple of captive - bred subadults was released, 52% of the male's captures and 54% of the female's were of two sloth species (Bradypus variegatus and Choloepus hoffmanni). At one Venezuelan nest, the remains comprised sloths . Monkeys regularly taken can include capuchin monkeys, saki monkeys, howler monkeys, titi monkeys, squirrel monkeys, and spider monkeys . Smaller monkeys, such as tamarins and marmosets, are seemingly ignored as prey by this species . At several nest in Guyana, monkeys made up about 37% of the prey remains found at the nests . Similarly, cebid monkeys made up 35% of the remains found at 10 nests in Amazonian Ecuador . Other partially arboreal and even land mammals are also preyed on given the opportunity, including porcupines, squirrels, opossums, anteaters, armadillos, and even relatively large carnivores such as kinkajous, coatis, and tayras . In the Pantanal, a pair of nesting eagles preyed largely on the porcupine (Coendou prehensilis) and the agouti (Dasyprocta azarae). The eagle may also attack bird species such as macaws: At the Parintins research site, the red - and - green macaw made up for 0.4% of the prey base, with other birds amounting to 4.6% ." Other parrots have also been preyed on, as well as cracids such as curassows and other birds like seriemas . Additional prey items reported include reptiles such as iguanas, tejus, and snakes . </P> <P> The eagle has been recorded as taking domestic livestock, including chickens, lambs, goats, and young pigs, but this is extremely rare under normal circumstances . They control the population of mesopredators such as capuchin monkeys which prey extensively on bird's eggs and which (if not naturally controlled) may cause local extinctions of sensitive species . </P>

What are the predators of the harpy eagle