The Wedge-tail Eagle, known colloquially as a ‘wedgie’, is the largest Australian raptor (bird of prey), standing at a metre tall. A truly magnificent bird, the Wedge-tail Eagle has an average wingspan of 2.3 metres though it can be up to 2.8 metres. They are Australia’s biggest bird of prey and one of the biggest eagles in the world and are similar in size to the American Bald Eagle. The Wedge-tail Eagle has a pale pink to cream beak, dark brown eyes, off-white feet and a wedge-shaped tail. They have a lifespan of 20 to 40 years. Males are 3.2 to 4 kg, while females are a slightly paler colour, larger and heavier at 4.2 to 5kg. Both sexes become progressively darker for the first ten years of their life.

Habitat & Distribution

The Wedge-tailed Eagle prefers wooded, forested land and open county. However, they can also be found in the mountains, near the sea, soaring in the air, or high in trees surveying their territory. The Wedge-tail is located in mainland Australia, Tasmania, and New Guinea. However, the Tasmanian Wedge-tail eagle is a distinct sub-species with genetic testing revealing the two species separated 200 to 1000 years ago. The Tasmanian population was established by mainland individuals flying across Bass Strait. Tasmanian Wedge-tails are darker in colour, have larger bodies and produce only one egg per clutch.

Diet

The Wedge-tails’ primary food source is carrion, preying on ground-dwelling animals and attacking with a fast swooping motion. Their diet consists of rabbits, mammals, lizards, possums, foxes, feral cats and carrion, and the eggs of other birds. They can carry prey up to 5kg in weight in their talons.

Eyesight

The Wedge-tail has binocular vision in which they can see their prey from great distances and in 8 times more detail than humans. In addition, their uniquely adapted eyes allow them to squeeze and extend their eyeball, enabling them to use their eyes similar to the zoom lens on a camera. Eagles have a third eyelid called the nictitating membrane. This eyelid is translucent and sweeps quickly across the eye from the inside corner. The eagle will sweep the nictitating membrane across the eye every few seconds to moisten and lubricate it. While it’s not completely clear, it still allows them to see.

Breeding

The breeding season occurs from June to October. They are monogamous, mating for life. Both the male and female groom each other during the breeding season. They build the nest together from sticks and leaves in the tallest tree in their area. The nest measures up to two metres wide and three metres deep. They often reuse the same nest year after year. A breeding pair usually only lays one clutch of eggs a year.

The female Wedge-tail lays a clutch of between 1 to 3 eggs over several days. Because of this, the eggs also hatch at different times. The female primarily incubates the eggs, while the male lines the nest daily with fresh leaves. The eggs hatch after 45 days, and chicks emerge covered in white downy feathers. The first chick that hatches is always the largest and sometimes kills the other chicks. The chicks are dependent on their parents for food for the first five weeks. The young Wedge-tail eagle leaves the nest after 12 weeks. However, they are not fully mature for six to eight years.

Threats

Wedge-tail Eagles are very common in Victoria. Sadly, farmers once considered them a menace. Convinced that the eagles carried off lambs, thousands of eagles were shot or poisoned. Subsequent research has found this false, as they rarely attack healthy lambs and never full-grown sheep. Current threats to Wedge-tails are loss of habitat due to clearing land and secondary poisoning from eating animals that have died from pesticides and baits. Road vehicle accidents also account for many deaths, with cars hitting the eagles while they are on the road eating roadkill. Additionally, wind farms also have an impact on their numbers.

Status

Wedge-tail eagles are protected in Victoria. Their status in Victoria is ‘secure’, and fines of up to $8000 apply to anyone found “killing, harassing or disturbing” the eagles.