You are viewing the article Just How Big and Powerful is the Harpy Eagle? at Tnhelearning.edu.vn you can quickly access the necessary information in the table of contents of the article below.
This article compares the Harpy Eagle’s weight, length, and wingspan with those of the world’s top three largest eagles to answer this question.
How big is the Harpy Eagle? Using body mass, length, and wingspan as metrics of size, the Harpy Eagle, is the world’s heaviest and longest eagle. In the wingspan category, though, the Harpy Eagle falls to fourth place among the world’s largest eagles. The Harpy Eagle has short and round wings, suitable for life inside dense tropical forests where it has to maneuver through dense vegetation. The Harpy Eagle does not regularly soar.
The Harpy Eagle Female is Larger than the Male.
In most birds, the male is larger than the female. But in some birds of prey, the female can be half as heavy as the male.
The reason for such size disparity between sexes has not been determined with certainty. Some ideas that may help explain such differences include:
Some ornithologists propose that the difference in size among raptors allows them to hunt prey of different sizes, therefore not competing for the same prey.
- To avoid competition between sexes. Some ornithologists propose that the difference in size among raptors allows them to hunt prey of different sizes, therefore not competing for the same prey.
The smaller male can hunt smaller and faster-moving prey while the female is better equipped to prey upon larger but less agile prey. Body size is then regarded as a measure of power and strength. - Different roles of males and females during breeding. The female Harpy Eagle does most of the incubation and stays on the nest during the first months after the egg hatches, protecting the young chick. During this period, the male provides food for the female and the growing chick in the nest. The larger female can protect the eggs and chicks, even from large predators like monkeys.
Because there is a greater amount of smaller prey in nature, the smaller male may be better equipped to consistently hunt and feed the female and chick in the nest. - Protection against aggressive males. Male Harpy Eagles have a reputation for having sudden bursts of aggression towards females. It is believed that the female Harpy Eagle chooses small males to make sure she can protect herself, the egg, or the chick from the attack of smaller but aggressive males.
Measurements of male and female Harpy Eagle. (See sources below)
The following table shows the weight, length, and wingspan of the male and female Harpy Eagle. Measurements used to compare the Harpy Eagle with other eagles are:
Weight – Female: Average: 8.3 kg (18.2 lb)
Length Male and Female: Average: 96.7 cm (32.3″)
Wingspan: Male and Female: Average: 203.5 cm (67.8″)
Weight – Male
Range: 4-4.8 Kg (8.8-10.6 lb)
Average: 4.4 kg (9.7 lb)
Maximum: 4.8 kg (10.6 lb)
Length Male and Female
Range: 86.5-107 cm (28.8-35.6 lb)
Average: 96.7 cm (32.3″)
Maximum: 107 cm (35.6″)
Wingspan: Male and Female
Range: 183-224 cm (61-74.6″)
Average: 203.5 cm (67.8″)
Maximum: 224 cm (74.6″)
Weight – Female
Range: 7.6-9 Kg (16.7-19.8 lb)
Average: 8.3 kg (18.2 lb)
Maximum: 9 kg (19.8 lb)
Comparing Eagle Measurements
Comparing bird measurements can be tricky. Measurements vary between sex, age, and just between individuals of the same species.
When it comes to comparing weight, the variation in measurements can be even greater. A bird’s weight can vary throughout the year and even the time of the day.
Added to the inherent individual variation among bird measurements is the fact that biologists in the field can obtain these metrics differently.
Variations in these metrics can make a comparison between eagle species less reliable. Accurate measurements are particularly important when comparing species of eagles of somewhat similar sizes.
Another source of error is that measures taken in the field are compared to measurements of birds kept in captivity. It is well established that captive birds are heavier than wild birds.
Understanding Eagle Weight, Length, and Wingspan.
Length, Weight, and Wingspan are rough indicators or size. These metrics are difficult to obtain and are rarely used in scientific studies.
- Weight: The weight or body mass of an eagle is obtained from live birds. As with the other measurements, weight can have a good deal of variation. Studies have shown that a bird’s weight can vary by 5 to 10% during a day.
- Length: The length of an eagle is the distance between the bill’s tip and the tip of the tail. It is obtained from dead museum specimens by laying the bird on its back and flattening out the head and neck gently. The length of an eagle is prone to error and is rarely used for any comparative study.
- Wingspan: An eagle’s wingspan is the distance between the wingtips when the wings are held outstretched. This measurement is obtained from live or dead birds before being prepared as museum specimens. The wingspan is used only as a rough estimation of size.
The Harpy Eagle’s Metrics Relative to other Eagles.
Body Weight
The Harpy Eagle is the world’s heaviest eagle, followed closely by the Steller’s Sea Eagle. In a more distant third place comes the Philippine Eagle.
When it comes to strength and power, the female Harpy Eagle is in a league of her own.
The female Harpy Eagle regularly hunts for sloths, monkeys, and other medium-sized arboreal mammals. Females Harpy Eagles have been reported to attack monkeys in the canopy, followed by a struggle as both the eagle and prey fall and fight on the ground.
The average prey size of a Harpy Eagle prey is 5.3 kg (11.6 lb).
The similarly heavy female Steller’s Sea Eagle feeds mainly on dead or live fish, especially Pacific salmon, and to a lesser extent, carcasses found near the coastline.
The average length and weight of the Pacific Salmon are 40.6 cm (16″) and 1.8 kg (lb), respectively.
On rare occasions, Steller’s Sea Eagles have been observed killing small birds that are injured or unable to fly. Overall, the Steller’s Sea Eagle does not use its size as a tool to subdue its prey.
The Philippine Eagle comes in third place. Like the Harpy Eagle, the magnificent Philippine Eagle also lives in dense tropical forests and hunts arboreal mammals, but its average prey size is smaller.
The Philippine Eagle hunts mostly Flying Lemurs and Palm Civets and, to a lesser extent, small monkeys, squirrels, bats, and rats.
The average prey size of a Philippine Eagle is 2.3 kg (5.1 lb).
The Harpy Eagle is the world’s heaviest and most powerful eagle by body weight and by the fact that it hunts larger prey items.
Top Three Eagle Species: Body Weight.
1. Harpy Eagle
Female
Maximum: 9 kg (19.8 lb)
Average: 8.3 kg (18.2 lb)
Range: 7.6-9 Kg (16.7-19.8 lb)
Male
Maximum: 4.8 kg (10.5 lb)
Average: 4.4 kg (9.7 lb)
Range: 4-4.8 Kg (8.8-10.5 lb)
2. Steller’s Sea Eagle
Female
Maximum: 9 kg (19.8 lb)
Average: 7.9 kg (17.4 lb)
Range: 6.8-9 kg (15-19.8 lb)
Male
Maximum: 6 kg (13.2 lb)
Average: 5.45 Kg (12 lb)
Range: 4.9-6 kg (10.8-12.2 lb)
2. Philippine Eagle
Male and Female
Maximum: 8 kg (17.6 lb)
Average: 6.4 kg (14.1 lb)
Range: 4.7-8 kg (10.3-17.6 lb)
Length
Most field guides provide the length of a bird as an indicator of size.
With 42.2″ from tip to tail, the Harpy Eagle is the world’s largest eagle, followed very closely by the Steller’s Sea Eagle with 41.3″. Given the small difference in length between these two eagles, the Harpy Eagle and the Steller’s Sea Eagle are practically tied in the first place.
Australia’s largest bird of prey, the Wedge-tailed Eagle, comes in third place. The Wedge-tailed Eagle has a total length of (41″) but weighs only (3 kg). This eagle’s long neck and tail are why it is categorized as one of the three top longest eagles.
Using an eagle’s length as an approximate estimation of size can be challenging. A perched eagle preening itself with the feathers fluffed in a relaxed posture may appear bulkier but shorter. The same eagle getting ready to take off with its neck stretched and its feathers close to its body may give the impression of a long and slender bird.
The key to judging an eagle’s length in the field is to watch it for several minutes, so the bird shows more than one posture and provides a better idea of its actual length.
Top Three Eagle Species: Length.
1. Harpy Eagle
Male and Female
Maximum: 107 cm (42.2 in)
Average: 96.7 cm (38.1 in)
Range: 86.5-107 cm (34-42.1 in)
2. Steller’s Sea Eagle
Female
Maximum: 105 cm (41.3 in)
Average: 95 cm (37.4 in)
Range: 85–105 cm (33.4-41.3 in)
2. Wedge-tailed Eagle
Female
Maximum: 104 cm (41 in)
Average: 92.5 cm (36.4 in)
Range: 81–104 cm (31.8-41 in)
Wingspan
With 254 cm wide, the Steller’s Sea Eagle has the longest wingspan, followed by the White-tailed Eagle (244 cm) and the Wedge-tailed Eagle (232 cm).
The Harpy Eagle comes in fourth place in the wingspan category.
The wingspan of an eagle is correlated to the wing function and the environment where an eagle lives. Steller’s Sea Eagle, White-tailed Eagle, and Wedge-tailed Eagle soar and glide in the open habitats they live. These eagles’ wings are long and narrow, suited for soaring, gliding, and fast-flying in open spaces.
Conversely, the Harpy Eagle does not soar but spends its entire life in the canopy and subcanopy of dense tropical forests. The Harpy eagle generally sits and waits motionless, waiting for the right time to launch an attack on an unassuming prey.
A burst of fast flight maneuvering through dense forest requires short and rounded wings.
The Philippine Eagle lives in similar tropical forests and uses a similar hunting technique. The Philippine Eagle has short and rounded wings the bird uses for a similar hunting strategy.
Top Three Eagle Species: Wingspan.
1. Steller’s Sea Eagle
Male and Female
Maximum: 245 cm (96 in)
Average: 220 cm (86.6 in)
Range: 195–245 cm (76.7-96.4 in)
2. White-tailed Eagle
Male and Female
Maximum: 244 cm (96 in)
Average: 218.5 cm (86 in)
Range: 193–244 cm (76-96 in)
3. Wedge-tailed Eagle
Male and Female
Maximum: 232 cm (91.3 in)
Average: 207 cm (81.4 in)
Range: 182–232 cm (71.6-91.3 in)
Conclusions
The Harpy Eagle is indeed the heaviest, longest, and more powerful eagle.
The now extinct Haast’s Eagle of New Zealand was the largest eagle ever to live. It was almost twice as big as the Harpy Eagle, with a bodyweight of approximately 15 kg (lb). The Haast’s Eagle hunted large flightless moas and other large prey, making the eagles large as an evolutionary response.
Do you agree with this analysis of the largest and most powerful eagle?
Do you have any experience with a Harpy Eagle?
References:
- Brazil, M. (1993). The world’s most spectacular raptor – Steller’s Sea Eagle. Birding World. 6(1): 28-31.
- Ferguson-Lees, J., and D. A. Christie (2001). Raptors of the World. Christopher Helm, London, UK. Brazil, M. (1993). The world’s most spectacular raptor – Steller’s Sea Eagle. Birding World. 6(1): 28-31.
- Fowler, J.M., and Cope, J.B. (1964). Notes on the Harpy Eagle in British Guiana. Auk. 81(3): 257–273.
- Howell, S. N. G., and S. Webb. 1995. A guide to the birds of Mexico and northern Central America. Oxford University Press, Oxford, United Kingdom.
- Schulenberg, T. S. (2020). Harpy Eagle (Harpia harpyja), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA.
Thank you for reading this post Just How Big and Powerful is the Harpy Eagle? at Tnhelearning.edu.vn You can comment, see more related articles below and hope to help you with interesting information.
Related Search:
