Head to head
Harpy Eagle vs Philippine Eagle
These are two of the biggest forest eagles in the world, apex predators of the rainforest canopy on opposite sides of the planet. The harpy eagle hunts the forests of Central and South America, taking sloths and monkeys with talons the size of a grizzly bear's claws. The Philippine eagle is confined to four islands in the Philippines, stands almost a metre tall, wears a shaggy crest like a mane, and is one of the rarest birds of prey on Earth.
| Harpy Eagle | Philippine Eagle | |
|---|---|---|
| Range | Southern Mexico through Central America to northern Argentina | Four islands of the Philippines only |
| Length | 86 to 107 cm | 90 to 100 cm; among the longest of all eagles |
| Weight | Females 6 to 9 kg; the heaviest eagle on average | Females 5 to 8 kg |
| Talons | Rear talon up to about 13 cm; grip among the strongest known | Very large, but the bird relies more on reach and bill |
| Main prey | Sloths and monkeys, plus other tree mammals and large birds | Colugos, monkeys, flying foxes, civets, hornbills |
| Crest | Double crest, raised when alert | Shaggy lanceolate crest forming a mane |
| Breeding rate | One chick every two to three years | One chick every two years |
| Conservation status | Vulnerable | Critically Endangered; a few hundred pairs |
Harpy Eagle vs Philippine Eagle: common questions
Which eagle is more powerful?
By the measures usually used, grip force and talon size relative to the prey it takes, the harpy eagle is the most powerful eagle in the world. Its legs are as thick as a person's wrist, its rear talons are longer than a grizzly bear's claws, and it can kill and lift prey approaching its own body weight, plucking three-kilogram sloths straight off branches. The Philippine eagle is a fraction longer and just as capable a hunter, but it is a slightly lighter, narrower bird that tends to hunt with a fast approach through the canopy and a strike, rather than the harpy's specialised snatch-and-carry.
Why is the Philippine eagle so endangered?
It has a tiny global range, breeds very slowly, and needs large tracts of old-growth rainforest, exactly the habitat that has been logged and cleared across the Philippines over the last century. A pair needs many square kilometres of forest and raises one chick every two years, so the population cannot absorb losses. On top of habitat loss, birds are still shot and caught in traps set for other animals. The total wild population is estimated at only a few hundred breeding pairs, almost half of them on Mindanao, which is why it is listed as Critically Endangered and is the focus of an intensive captive-breeding and forest-protection effort.
Do either of these eagles take human children?
There is no reliable evidence that either species preys on people. Both are strong enough to injure a person defending a nest, and both have the size to make the idea plausible, which is why the stories persist, but documented diets are dominated by tree-dwelling mammals and birds. The Philippine eagle was once called the monkey-eating eagle, and monkeys are genuinely important prey, but the name was changed partly because it was misleading about the bird's varied diet. Attacks on humans, when they happen at all, are defensive strikes near an active nest.