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What the sources say

Harpy EagleHarpia harpyja

Every figure, record and mechanism on the Harpy Eagle profile was written from a source, and this is the working table behind it: 45 claims checked word for word against these sources. The left column is what the page says. The right column is the source's own words, copied, not paraphrased; a ... marks a cut and[brackets] an insertion. Open any source and check it yourself.

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Source
01

Animal Diversity Web, University of Michigan

Harpia harpyja (harpy eagle). Animal Diversity Web, University of Michigan.

The page saysApex canopy raptor
The source saysHarpy eagles are apex predators of their rainforest ecosystems.
The page saysMostly the mid to upper canopy of tropical lowland rainforests, preferring undisturbed forest, from southern Mexico to northern Argentina
The source saysfound from southern Mexico to the eastern part of Bolivia, southern Brazil, and northern Argentina ... Harpy eagles live in the canopies of tropical lowland rainforests. They prefer undisturbed forests ... They generally are found in mid to upper levels of rain forest canopies
The page saysis the largest species of eagle, according to Animal Diversity Web
The source saysHarpy eagles are the largest species of eagle
The page saysa body up to 102 centimeters long
The source saysa body length that can range from 89 to 102 cm
The page saysAnimal Diversity Web estimates that a healthy wild harpy eagle lives 25 to 35 years
The source saysHarpy eagles are estimated to live 25 to 35 years if they remain healthy.Note: ADW's own estimate, attributed and hedged; never stated as fact.
The page saysSloths and monkeys, including howler monkeys, are its main food sources
The source saysHarpy eagles' main food sources are sloths and primates
The page saysLong black crown feathers rise into a crest when the harpy eagle feels threatened, and some have suggested it also raises them to direct sound to its ears
The source saysThe crown of harpy eagles consists of long black feathers which raise when threatened, though some theorize they also raise them to direct sound to their ears.
The page saysHarpy eagles range from southern Mexico to the eastern part of Bolivia, southern Brazil, and northern Argentina
The source saysfound from southern Mexico to the eastern part of Bolivia, southern Brazil, and northern Argentina
The page saysdangerLevel: Low
The source saysthe eagles overall have no adverse effects on humansNote: task #799; no cached source describes a harpy eagle injuring a person. The talon force (SDZ) is described on prey only.

Source
02

San Diego Zoo Wildlife Alliance

Harpy Eagle. San Diego Zoo Wildlife Alliance.

The page saysApex canopy raptor armed with rear talons larger than a grizzly bear's claws
The source sayscurved, back talons are larger than grizzly bear claws at 5 inches (13 centimeters) long!
The page saysSloths and monkeys, including howler monkeys, snatched from the canopy, plus opossums, porcupines, and iguanas
The source saysuses its great talons to snatch up monkeys and sloths ... A harpy also feeds on opossums, porcupines, young deer, snakes, and iguanas.
The page saysRear talons about five inches long, larger than a grizzly bear's claws, that the San Diego Zoo says can exert several hundred pounds of pressure, crushing bones and killing prey instantly
The source sayscurved, back talons are larger than grizzly bear claws at 5 inches (13 centimeters) long! ... The deadly talons of a harpy eagle can exert several hundred pounds of pressure (over 50 kilograms), crushing the bones of its prey and instantly killing its victim.Note: SDZ's own claim, no study cited on the page; attributed to SDZ rather than stated as a measurement.
The page saysThe San Diego Zoo puts females at 6.3 to 9 kilograms and the smaller males at 3.8 to 5.4 kilograms
The source saysfemale is larger than male Weight: Female, 14 to 20 pounds (6.3 to 9 kilograms); male, 8.5 to 12 pounds (3.8 to 5.4 kilograms)Note: Final pass: replaced ADW's older averages (males 5 to 8 kg) with the current SDZ ranges, which disagree on males.
The page saysa wingspan reaching up to 2 meters (6.5 feet)
The source sayswingspan, which can reach up to 6.5 feet (2 meters) across
The page saysIts curved rear talons are about 13 centimeters (5 inches) long, which the San Diego Zoo says makes them larger than a grizzly bear's claws
The source sayscurved, back talons are larger than grizzly bear claws at 5 inches (13 centimeters) long!
The page saysthey sit on legs as thick as a small child's wrist
The source saysThe harpy eagle's legs can be as thick as a small child's wrist.
The page saysThe San Diego Zoo describes talons that can exert several hundred pounds of pressure, enough to crush the bones of their prey and kill it instantly
The source saysThe deadly talons of a harpy eagle can exert several hundred pounds of pressure (over 50 kilograms), crushing the bones of its prey and instantly killing its victim.Note: SDZ's own claim, no study cited on the page; attributed to SDZ rather than stated as a measurement.
The page saysA harpy eagle never soars over the top of the rainforest. It flies below the canopy instead
The source saysYou will never see a harpy eagle soaring over the top of a rainforest. Instead, the powerful harpy flies below the forest canopy
The page saysin a serious chase it is capable of reaching 80 kilometers per hour (50 mph)
The source sayscapable, in a serious chase, of reaching speeds of 50 miles per hour (80 kilometers per hour)
The page saysIts eyesight can pick out something under 2 centimeters across from almost 200 meters away
The source sayscan see something less than 1 inch (2 centimeters) in size from almost 220 yards (200 meters) away
The page saysa harpy eagle will perch silently for up to 23 hours, waiting to catch unsuspecting prey
The source saysperches silently for hours—up to 23!—in a tree, patiently waiting to catch unsuspecting prey
The page saysthe San Diego Zoo says the monkeys and sloths it snatches from the branches can weigh up to 7.7 kilograms (17 pounds)
The source saysuses its great talons to snatch up monkeys and sloths that can weigh up to 17 pounds (7.7 kilograms)!
The page saysA separate set of smaller face feathers forms a disc that the San Diego Zoo says may focus sound to improve hearing, similar to owls
The source saysSome smaller gray feathers create a facial disk that may focus sound waves to improve the bird's hearing, similar to owls.
The page saysharpies usually build 27 to 43 meters (90 to 140 feet) above the ground, favoring silk-cotton (kapok) trees with widely spaced branches for a clear flight path
The source saysFor nesting, harpies favor silk-cotton trees (kapok trees) and usually build nests 90 to 140 feet (27 to 43 meters) above the ground. They like to use trees with widely spaced branches for a clear flight path to and from the nest.
The page saysMost of its food comes from the canopy and understory rather than the forest floor
The source saysMost of the harpy’s food is found in the rainforest canopy and understory instead of on the forest floor.
The page saysThe San Diego Zoo says the larger females tend to take sloths and monkeys, which can weigh up to 17 pounds (7.7 kilograms), while the smaller males take more small prey
The source saysmonkeys and sloths that can weigh up to 17 pounds (7.7 kilograms)! ... The larger females tend to take sloths and monkeys; the smaller, more agile and faster males tend to take more quantities of smaller food items.
The page saysIt also lists opossums, porcupines, young deer, snakes, and iguanas as prey
The source saysA harpy also feeds on opossums, porcupines, young deer, snakes, and iguanas.
The page saysPrey too heavy to carry whole to the nest is taken to a stump or low branch and partly eaten there
The source saysHeavier prey is taken to a stump or low branch and partially eaten, since it is too heavy to be carried whole to the nest.
The page saysThe San Diego Zoo says that despite a wingspan of up to 2 meters (6.5 feet), harpy eagles move through their forest home with great agility
The source saysDespite their wingspan, which can reach up to 6.5 feet (2 meters) across, harpies fly through their forest home with great agility.
The page saysThe wings are short and broad, which helps the eagle climb almost vertically and attack from below as well as from above
The source saysIts short, broad wings help the harpy fly almost straight up, too, so it can attack prey from below as well as above.
The page saysThe nest is a frame of large sticks lined with softer greens, seedpods, and animal fur, and it can measure about 1.5 meters (5 feet) across
The source saysHarpies use large sticks to create the nest's huge frame and line it with softer greens, seedpods, and animal fur to make it warm and comfortable. A harpy nest measures about 4 feet (1.2 meters) thick and 5 feet (1.5 meters) across
The page saysa harpy eagle perches silently for up to 23 hours before snatching monkeys and sloths from the branches
The source saysThe bird perches silently for hours—up to 23!—in a tree, patiently waiting to catch unsuspecting preyNote: task #799, vibe.reason

Source
03

AnAge: The Animal Ageing and Longevity Database, Human Ageing Genomic Resources

Harpia harpyja. AnAge: The Animal Ageing and Longevity Database, Human Ageing Genomic Resources.

The page saysthe maximum AnAge lists is 16.8 years, for a captive bird recorded in a 1938 study of bird longevity
The source saysMaximum longevity 16.8 years (captivity) Source ref. 575 ... [ 0575 ] Flower (1938), Furter notes on the duration of life in animals. IV. Birds

Source
04

Miranda et al. 2019

Miranda et al. (2019). Species distribution modeling reveals strongholds and potential reintroduction areas for the world's largest eagle. PLOS ONE.

The page saysA 2019 study on the species put the average at 6.6 kilograms and called it "the largest extant raptor on Earth"
The source saysAveraging 6.6 kg, the Harpy Eagle is the largest extant raptor on Earth
The page saysbeaten in size only by the extinct Haast eagle of New Zealand
The source sayssurpassed in size by only the extinct, island-living Haast Eagle (Harpagornis moorei ...), which humans wiped out from New Zealand's South Island
The page saysa 2019 study found that Amazonian forests held 93% of the species' current distribution
The source saysAmazonian forests currently represent 93% of the current distribution of the species

Source
05

Miranda et al. 2021

Miranda et al. (2021). Tropical deforestation induces thresholds of reproductive viability and habitat suitability in Earth's largest eagles. Scientific Reports.

The page saysA 2021 study of 16 active nests in Amazonian landscapes that had lost 0 to 85% of their forest
The source saysWe monitored 16 active harpy eagle nests embedded within landscapes that had experienced 0 to 85% of forest loss
The page saysharpy eagles could not switch to open-habitat prey in deforested areas, that feeding rates fell with forest loss, and that landscapes deforested by more than 70% supported no nests
The source saysHarpy eagles could not switch to open-habitat prey in deforested habitats ... Feeding rates decreased with forest loss ... Because landscapes deforested by > 70% supported no nests
The page saysThree fledged eaglets in that study died of starvation in landscapes that had lost 50 to 70% of their forest
The source saysthree fledged individuals dying of starvation in landscapes that succumbed to 50–70% deforestation

Source
06

Gil-da-Costa et al. 2003

Gil-da-Costa et al. (2003). Rapid acquisition of an alarm response by a neotropical primate to a newly introduced avian predator. Proceedings of the Royal Society of London. Series B: Biological Sciences.

The page saysincluding howler monkeys
The source saysmantled howler monkeys (Alouatta palliata), one of their primary prey
The page saysMantled howler monkeys are "one of their primary prey"
The source saysmantled howler monkeys (Alouatta palliata), one of their primary prey
The page saysafter harpy eagles were reintroduced to Barro Colorado Island in Panama, where they had been extinct for 50 to 100 years, researchers played eagle calls to the island's howlers
The source sayswe took advantage of the recent reintroduction of radio-tagged harpy eagles (Harpia harpyja) to Barro Colorado Island (BCI), Panama ... we broadcast harpy eagle calls to howlers on BCI ... Although harpies have been extinct from this area for 50-100 yearsNote: Design: the researchers used an existing reintroduction and broadcast recorded calls; they did not reintroduce the eagles themselves.
The page saysThe monkeys quickly picked up an anti-predator response to those calls, ignored other birds' calls
The source saysBCI howlers rapidly acquired an adaptive anti-predator response to harpy calls, while showing no response to other avian vocalizations
The page sayskept it up several months after the eagles were removed
The source sayshowlers maintained this response several months after the removal of the eagles

Source
07

The IUCN Red List of Threatened Species 2021

Harpia harpyja. The IUCN Red List of Threatened Species 2021: e.T22695998A197957213.

The page saysThe IUCN lists the species as Vulnerable
The source saysIUCN Red List category: Vulnerable (VU).

How the table was made: a writer drafted the profile from these sources and logged each claim with its quote, a reviewer with nothing but this table checked every sentence said no more than its quote, and a script confirmed each quote appears word for word in the source. The method is in the site'sAbout page.