Wedge-tailed eagle facts for kids

Quick facts for kids Wedge-tailed eagle
At Captains Flat, New South Wales
Conservation status
Least Concern (IUCN 3.1)
CITES Appendix II (CITES)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Accipitriformes
Family:	Accipitridae
Genus:	Aquila
Species:	A. audax
Binomial name
Aquila audax (Latham, 1801)
Subspecies
A. a. audax (Latham, 1801) A. a. fleayi Condon & Amadon, 1954
Range of A. audax      Resident
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Synonyms
Vultur audax Latham, 1801 Aquila albirostris Vieillot, 1816 Aquila fuscosa Dumont, 1816 Aquila cuneicaudata C.L. Brehm, 1845 Aquila audax carteri Mathews, 1912

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The wedge-tailed eagle (Aquila audax) is the largest bird of prey in Australia. It also lives in southern New Guinea and on the island of Tasmania. People often call it the "wedgie" because of its distinctive diamond-shaped tail.

This majestic raptor belongs to the genus Aquila, which includes "booted eagles" known for fully feathered legs. It possesses broad wings, a huge hooked beak, and powerful talons. Its enormous wingspan can reach up to 2.84 m (9 ft 4 in).

Wedge-tailed eagles are adaptable hunters found across forests, open grasslands, mountains, and deserts. They hunt a wide variety of animals, ranging from marsupials to birds and lizards. They also feed on carrion (dead animals), helping to clean up the environment.

These birds form strong, lifelong pairs. They build massive stick nests in tall trees and defend large hunting territories. Despite past conflicts with humans, the species remains resilient and thrives across much of its natural habitat.

Taxonomy and Evolutionary History

English ornithologist John Latham first described the wedge-tailed eagle scientifically in 1801. He gave it the scientific name Vultur audax.

Early scientists originally placed it in the vulture family due to its bare facial skin and scavenging habits. Later, researchers moved it into its own genus named Uroaetus. Today, scientists classify it in the true eagle genus Aquila.

The specific scientific name audax comes from Latin and means "bold" or "daring." This name reflects the eagle's fearless hunting style. However, these eagles are generally very shy and cautious around humans.

Booted Eagle Family Relations

The wedge-tailed eagle belongs to the bird family Accipitridae, which includes hawks, kites, and eagles. Inside this family, it sits within the subfamily Aquilinae, known as booted eagles.

Booted eagles get their name from their densely feathered legs, which look like warm boots. This feature protects them from biting prey and harsh weather. There are about 39 species of booted eagles across the globe.

Genetic research shows that the wedge-tailed eagle is closely related to the Verreaux's eagle of Africa. It is also a very close relative of the Gurney's eagle found in New Guinea. Together with the famous golden eagle, they form an evolutionary group of large aerial apex predators.

Recognised Subspecies

Scientists recognise two distinct subspecies of the wedge-tailed eagle:

• A. a. audax (Latham, 1801) – This is the mainland subspecies found across all of continental Australia and southern New Guinea.
• A. a. fleayi (Condon & Amadon, 1954) – This subspecies is endemic to Tasmania. It is named after the Australian naturalist David Fleay.

The Tasmanian subspecies is larger and darker than mainland birds. It displays deep chocolate-brown feathers and has larger talons. DNA tests show that the Tasmanian population has been isolated from mainland eagles for thousands of years.

Physical Characteristics and Size

Wedge-tailed eagles are massive, dark-coloured raptors. Adult eagles appear dark brownish-black to charcoal black. They feature pale golden-brown hackles (pointed neck feathers) that form a cape around the neck.

They possess large, pale beaks and creamy-white feet. The bare skin around their face helps them regulate their body temperature in warm climates. Males and females look identical in colour, though females are significantly larger.

Juvenile eagles look quite different from adults. Young birds are medium brown with reddish-buff edges on their feathers. They also have a lighter, golden-brown head and a wide pale band across their upper wings.

As young eagles grow, their plumage darkens with each yearly moult (feather replacement). They take about seven to eight years to gain full adult black plumage. Their moult happens gradually so it never interferes with flight.

Wingspan and Body Measurements

The wedge-tailed eagle ranks among the largest eagles in the world. As in most birds of prey, females display sexual dimorphism and are about 15% to 30% heavier than males.

• Adult females weigh between 3.0 and 5.8 kg (6.6 and 12.8 lb).
• Adult males weigh between 2.0 and 4.0 kg (4.4 and 8.8 lb).
• Total body length ranges from 81 to 106 cm (32 to 42 in).
• Typical wingspan spans from 182 to 232 cm (6 ft 0 in to 7 ft 7 in).

The largest verified wingspan for any eagle belonged to a female wedge-tailed eagle in Tasmania. Measured in 1931, her wings stretched an amazing 284 cm (9 ft 4 in).

Their tail measures up to 45 cm (18 in) in length. This is proportionately longer than the tail of almost any other eagle species. This long tail provides incredible stability when soaring in strong mountain updrafts.

Flight Mechanics and Vision

In flight, the wedge-tailed eagle creates an unmistakable silhouette. Its long wings have fingered flight feathers at the tips, held in a slight V-shape called a dihedral angle.

The eagle soars with minimal effort, riding warm rising air currents called thermals. Pilots in gliders have spotted wedge-tailed eagles soaring higher than 3,000 m (9,800 ft) above the ground.

These eagles possess incredible eyesight that is three times sharper than human vision. Their eyes are as large as human eyes and can see into the ultraviolet spectrum. This sharp sight helps them spot small prey moving through tall grass from miles away.

Vocalisations and Sounds

Wedge-tailed eagles are generally quiet birds. They spend long periods outside the breeding season without making any noticeable sounds.

Near their nests, they make high-pitched, thin whistles transcribed as I-see, I-see followed by a soft see-tya. They may also utter yelps, squeals, and rolling chattering calls when displaying in the air.

Geographic Range and Habitat Distribution

Wedge-tailed eagles live across Australia, Tasmania, and southern New Guinea. In Australia, their range extends from the northern tip of Cape York to southern Victoria, and from coast to coast.

They inhabit offshore islands such as Fraser Island, Kangaroo Island, and the Tiwi Islands. In Tasmania, they live throughout native eucalyptus forests. In New Guinea, they occupy the grasslands and savannas of the Trans-Fly region.

Preferred Habitats

The wedge-tailed eagle thrives in a wider variety of habitats than almost any other booted eagle:

• Open eucalyptus and acacia woodlands
• Savannas and arid shrublands
• Alpine grasslands and subalpine mountain peaks
• Semi-arid deserts and gibber plains
• Edges of tropical rainforests and coastal plains

They prefer open country mixed with tall trees and rocky hills. They avoid dense unbroken rainforests and heavily built-up cities. However, they frequently visit farmland and open pastures where visibility is high.

Behaviour and Daily Activities

Wedge-tailed eagles spend early mornings perching on high vantage points like dead trees, rock outcrops, or power poles. From these perches, they scan the landscape for food while warming up in the sun.

During the hottest parts of the day, they use rising thermals to soar high into the sky. Soaring allows them to patrol their home ranges while conserving physical energy.

Adults are generally sedentary, remaining in the same home territory year-round. Young eagles, on the other hand, wander widely across the country. Banded juveniles have been recorded traveling over 800 km (500 mi) within months after leaving their parents.

Territorial Defence and Playful Actions

Wedge-tailed eagles defend territories fiercely against intruders. Pairs perform aerial displays by diving steeply, swooping upward, and rolling over to show their talons.

They sometimes attack strange objects entering their airspace. Eagles have attacked hang gliders, paragliders, and mining survey drones that fly too close to their active nests.

Young eagles often show playful behaviour. They have been observed dropping sticks in mid-air and diving to catch them before they touch the ground. Immature birds also practice flying skills by mock-fighting with other juveniles.

Mobbing by Smaller Birds

Because wedge-tailed eagles are top predators, their appearance causes panic among smaller bird species. Birds like Australian magpies, ravens, butcherbirds, masked lapwings, and falcons regularly mob perched or flying eagles.

Flocks of smaller birds dive-bomb the eagle, calling loudly to drive it away. The eagle usually ignores these attacks, but it may roll in mid-air to show its talons if a mobber gets too close.

Hunting Tactics and Dietary Biology

The wedge-tailed eagle is an apex predator sitting at the very top of the food chain. It hunts by soaring high to spot targets, followed by a swift, angled dive called a stoop.

It can also hunt from a low perch or fly fast just above tree canopies to surprise prey. The eagle strikes prey with its talons, using its powerful feet and sharp hallux claw (hind claw) to catch and hold animals.

Wedge-tailed eagles can carry prey weighing up to 5 kg (11 lb) in flight. If an animal is too heavy to lift, the eagle feeds on the ground and covers the leftovers with leafy branches to hide it from scavengers.

Cooperative Team Hunting

Wedge-tailed eagles frequently hunt in pairs or small family groups. Cooperative hunting allows them to catch animals much larger than themselves.

During a cooperative hunt, one eagle flies low to distract and flush the prey. Meanwhile, the second eagle swoops down silently from behind to make the capture.

In arid areas, groups of up to 15 eagles have been observed working together to exhaust large kangaroos. Pairs have even been seen chasing prey toward steep slopes or farm fences to block escape paths.

Scavenging and Roadkill Cleanup

Carrion makes up a significant part of the eagle's diet, especially for younger birds learning to hunt. Eagles spot scavenging ravens from miles away and glide down to claim carcasses.

In rural areas, wedge-tailed eagles regularly feed on roadkill along quiet highways. Large groups of up to 20 eagles sometimes gather around a big carcass.

After a large meal, an eagle can gorge on 1.5 kg (3.3 lb) of meat at once. When full, an adult eagle can survive for weeks without eating again. Like owls, eagles cough up an undigested pellet of fur, bones, and feathers after feeding.

Prey Spectrum and Food Preferences

• 

  Bearded dragons are the most common reptile prey in arid zones.

• 

  The European rabbit is widely hunted across Australia.

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  Adult pairs can hunt large eastern grey kangaroos.

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  Noisy birds like galahs are taken opportunisticly.

Wedge-tailed eagles eat more than 200 different animal species across Australia. Studies show that mammals make up about 60% to 90% of their total prey biomass, followed by birds and reptiles.

Mammals in the Diet

Introduced European rabbits and European hares form a major part of the eagle's diet in southern and eastern Australia. Since rabbits were brought to Australia in the 19th century, eagles have relied heavily on them for food.

Native marsupials are the eagle's primary natural prey:

• Young red kangaroos and eastern grey kangaroos
• Wallabies, pademelons, and rock-wallabies
• Common brushtail possums and ringtail possums
• Bandicoots, bettongs, and wombats

Eagles occasionally hunt adult kangaroos weighing over 35 kg (77 lb) through cooperative attacks. They also catch introduced red foxes, feral cats, and occasionally scavenge dead livestock like sheep.

Birds as Secondary Prey

Birds form an important secondary food source. The most common avian prey include Australian ravens, Australian magpies, cockatoos, galahs, and wood ducks.

Eagles also hunt large ground-dwelling birds, including young emus and the Australian bustard. Waterfowl such as black swans, pelicans, and herons are taken near inland lakes and rivers.

Reptiles and Invertebrates

In desert environments, reptiles become crucial prey. The central bearded dragon is a favourite target for arid-zone eagles.

Eagles also capture large monitor lizards (goannas), skinks, and various venomous snakes, including eastern brown snakes and tiger snakes. They rarely eat cane toads, fish, or insects.

Reproduction and Life Cycle

Wedge-tailed eagles breed between July and December across southern Australia. In warmer northern regions, breeding can begin as early as January or February.

Pairs stay together for life and defend breeding territories ranging from 15 to 50 km² (5.8 to 19.3 sq mi). During drought years in central Australia, pairs may delay breeding until rainfall and food supplies return.

Nest Architecture

Wedge-tailed eagles build some of the largest bird nests in the world. They construct massive platforms of heavy sticks in the fork of a large, mature tree.

• Newly built nests measure about 1 m (3.3 ft) across and 0.8 m (31 in) deep.
• Old nests used year after year can reach 2.5 m (8.2 ft) across and nearly 4 m (13 ft) deep.
• Heavy nests can weigh over 400 kg (880 lb).

The female lines the central nest bowl with soft green eucalyptus leaves and twigs. Pairs often maintain two or three alternate nests in their territory. In desert areas where tall trees are absent, eagles may nest on rock ledges, cliffs, or utility towers.

Small birds like finches and pardalotes sometimes build nests inside the stick walls of an active eagle nest. They gain free protection from predators that avoid the large eagle family.

Eggs and Incubation

The female lays a clutch of one to four eggs, with two eggs being most common (around 80% of clutches). The eggs are off-white and heavily marked with reddish-brown, lavender, and purple speckles.

• Each egg weighs between 120 and 150 g (4.2 and 5.3 oz).
• Incubation lasts between 42 and 48 days.

The female does most of the incubating, while the male hunts and delivers food to the nest. The male also takes short shifts sitting on the eggs while the female feeds and stretches her wings.

Growth of Young and Fledging

When chicks hatch, they are covered in pure white down feathers. By two weeks of age, a second layer of grey woolly down appears. Dark contour feathers begin emerging on their wings and back around four weeks.

Young eaglets grow rapidly:

• At 15 days, chicks weigh about 1.17 kg (2.6 lb).
• At 29 days, they weigh about 2.6 kg (5.7 lb).
• At 49 days, they reach about 3.2 kg (7.1 lb) and are nearly fully feathered.

Chicks begin exercising their wings at 50 days, jumping and pouncing on sticks in the nest. They fledge (take their first flight) between 67 and 95 days of age.

Parental Care and Maturity

Young fledglings remain dependent on their parents for food for four to six months. Parents teach them to catch live prey and scavenge for carcasses.

Once young eagles leave their parents' territory, they live as wandering "floaters" until they reach adulthood. Young eagles face high mortality during their first few years of life.

Survivors reach sexual maturity and choose a mate at around six to eight years of age. In the wild, healthy adults can live for 20 to 25 years. Captive eagles in wildlife sanctuaries have lived up to 40 years.

Ecology and Interspecific Relationships

As Australia's largest land predator, the wedge-tailed eagle dominates other local birds of prey. It regularly drives smaller raptors, including kites and harriers, away from food sources.

The eagle shares its habitat with two other large raptors:

• The little eagle – A smaller booted eagle that also hunts rabbits, but occupies lower trophic levels.
• The white-bellied sea eagle – A powerful coastal raptor that hunts fish and waterbirds.

Wedge-tailed eagles occasionally clash with white-bellied sea eagles over territory boundaries. The two species engage in spectacular cartwheeling dogfights, locking talons in mid-air before separating safely.

Eagles have no natural adult predators in Australia. However, nesting eagles can lose unhatched eggs to ravens and currawongs if parents leave the nest unattended. Peregrine falcons have occasionally attacked and injured adult eagles that flew too close to falcon cliff nests.

Conservation Status and Environmental Threats

The IUCN classifies the wedge-tailed eagle as a species of Least Concern. Its total population is estimated to exceed 100,000 mature individuals across Australia.

During the late 19th and early 20th centuries, farmers believed eagles killed large numbers of healthy lambs. As a result, governments offered cash bounties for dead eagles. Between 1958 and 1967 alone, over 120,000 bounties were paid in Queensland and Western Australia.

Scientific research proved that eagles primarily scavenged already-dead lambs. Today, strict wildlife laws protect wedge-tailed eagles across Australia.

Modern Environmental Challenges

Despite healthy overall numbers, wedge-tailed eagles face several human-related threats:

• Loss of old-growth nesting trees through logging and land clearing
• Accidental poisonings from eating baits meant for invasive rabbits and wild dogs
• Vehicle collisions while feeding on roadside roadkill
• Collisions with wind turbine blades, powerlines, and high fences
• Lead poisoning from eating shot game left in the field

Threatened Status in Tasmania

The Tasmanian subspecies (A. a. fleayi) is classified as Endangered under Australian environmental law. Fewer than 100 breeding pairs remain on the island.

Tasmanian eagles require large patches of undisturbed native forest to build their nests. They are extremely sensitive to human noise, and logging or clearing within 500 m (1,600 ft) of a nest can cause parents to abandon their chicks.

Conservationists have established buffer zones around all known Tasmanian nests to stop logging during the breeding season. Wildlife agencies also work with wind farm operators to protect flight paths and prevent bird strikes.

Cultural Significance and Symbols

The wedge-tailed eagle holds deep cultural significance for Indigenous Australians. Many Aboriginal Dreamtime stories feature the eagle, known as Bunjil among the Kulin nation of Victoria, as a creator ancestor and protector spirit.

In modern Australia, the bird appears on numerous official emblems and coats of arms:

• The official bird emblem of the Northern Territory
• The cap badges of the New South Wales Police Force and Northern Territory Correctional Services
• The coat of arms of La Trobe University in Melbourne
• The official flags and badges of the Australian Defence Force and Royal Australian Air Force
• The Boeing E-7 Wedgetail airborne early warning aircraft

The West Coast Eagles, a prominent team in the Australian Football League, uses the eagle as its mascot and logo. A trained wedge-tailed eagle named "Auzzie" frequently performs pre-match flights before home games in Perth.

Gallery

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  A wedge-tailed eagle perching atop a dead tree

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  A juvenile eagle showing paler brown plumage

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  Close-up showing the large bill and facial skin

See also

In Spanish: Águila audaz para niños