Northern Goshawk

Informazioni

The Northern Goshawk is a powerful, medium-large raptor known for its fierce hunting prowess and agile flight through dense forests. It is a highly territorial and secretive bird of prey, often difficult to observe due to its preference for mature woodlands.

Dimensioni e longevità

Lunghezza

46-63 cm (18-25 in)

Apertura alare

89-122 cm (35-48 in)

Peso

Males: 500-1100 g (1.1-2.4 lbs), Females: 800-1600 g (1.8-3.5 lbs)

Longevità

Typically 10-12 years in the wild, up to 20 years recorded

Dieta

Carnivore (primarily birds and mammals)

Caratteristiche fisiche

Piumaggio

Adults have dark slate-grey to brownish-grey upperparts, with finely barred white underparts. The barring is typically dense and wavy. They have a prominent white supercilium (eyebrow stripe) that extends behind the eye, and a dark cap. Juveniles are brown above with streaked underparts, often with a buffy wash.

Forma del becco

Strong, hooked beak, dark grey to black with a yellow cere.

Colore degli occhi

Adults have bright orange to deep red eyes, becoming more intense with age. Juveniles have yellow eyes.

Colore delle zampe

Yellow

Caratteristiche distintive

Broad, rounded wings and a relatively long tail, often appearing square-tipped or slightly notched. The flight profile shows a distinctive 'S' curve to the trailing edge of the wing. Powerful build and fierce expression.

Aspetto giovanile

Juveniles are distinctly different from adults. They have brown upperparts with buffy feather edgings, and creamy-white underparts heavily streaked with dark brown. Their eyes are yellow, gradually changing to orange/red over 2-3 years.

Cambiamenti stagionali

No significant seasonal plumage changes. Plumage becomes more worn and faded towards the end of the breeding season before molting.

Dimorfismo sessuale

Females are significantly larger and heavier than males (reverse sexual dimorphism), often by 25-50% in weight and 10-15% in length and wingspan. Plumage is similar, though females may appear slightly browner on the back.

Come identificare

1. 1

   Size and Build

   Look for a large, powerful accipiter. Females are notably larger than males. Its robust build and broad wings are key.

2. 2

   Plumage (Adult)

   Dark grey back, finely barred white underparts, and a striking white supercilium. Red eyes are a strong indicator in adults.

3. 3

   Plumage (Juvenile)

   Brown back, heavily streaked brown on buffy-white underparts, and yellow eyes. The streaking is coarser than in juvenile sparrowhawks.

4. 4

   Tail Shape

   Relatively long tail, often appearing square-tipped or slightly notched at the end, unlike the rounded tail of Cooper's Hawk.

5. 5

   Flight Style

   Powerful, direct flight with rapid wing beats and glides. Agile maneuvering through dense forest. When soaring, wings are held flat or slightly bowed.

6. 6

   Vocalization

   Listen for the characteristic rapid 'kek-kek-kek' call, especially near nesting sites.

Habitat e areale

Biomi

Temperate and boreal forests, taiga, mixed woodlands, deciduous and coniferous forests.

Areale geografico

Holarctic distribution, found across North America, Europe, and Asia. In Europe, it is widespread from Scandinavia south to the Mediterranean, and east across Russia. In North America, it ranges from Alaska and Canada south through the western mountains to Mexico, and in the northeastern US.

Fascia altitudinale

Sea level up to 3,000 meters (10,000 ft), depending on local forest availability.

Ambienti preferiti

Mature or old-growth forests with a mix of dense canopy and open understory, often near clearings or forest edges for hunting. Requires large, undisturbed tracts of forest for breeding.

Comportamento

Periodo di attività

Diurnal, most active during daylight hours, particularly morning and late afternoon.

Abitudini alimentari

A powerful and opportunistic predator. Hunts primarily birds (e.g., pigeons, jays, grouse, pheasants, woodpeckers) and mammals (e.g., squirrels, rabbits, hares, voles). Hunts by surprise attack, often flying low and fast through dense cover, or from a perch. Known for its aggressive pursuit of prey.

Comportamento sociale

Generally solitary outside the breeding season. Monogamous pairs form during breeding. Highly territorial, especially around the nest site, and will aggressively defend against intruders, including humans.

Tipo di volo

Powerful and agile flight, characterized by rapid wing beats interspersed with glides. Can fly at high speed through dense forest, maneuvering expertly around obstacles. Soars on thermals during migration or display flights, but typically flies low when hunting.

Migrazione

Northern populations are migratory, moving south for the winter. Southern populations are largely resident. Juveniles tend to disperse more widely than adults. Migration is often irruptive in response to prey availability.

Territorialità

Highly territorial, especially during the breeding season. Pairs defend a large breeding territory, often several square kilometers, with aggressive displays and vocalizations.

Riproduzione

Stagione riproduttiva

March to June, with egg-laying typically in April-May.

Abitudini di nidificazione

Builds a large stick nest, often 60-150 cm (2-5 ft) in diameter, high in a tall tree (conifer or deciduous) in a dense forest stand. Nests are typically reused for many years, with new material added annually. Both sexes participate in nest building.

Dimensione della covata

2-4 eggs

Descrizione dell'uovo

2-4 (occasionally 1-5) eggs, dull white or pale bluish-white, sometimes faintly marked with brown. Roughly oval, about 58 x 45 mm.

Periodo di incubazione

35-42 days, primarily by the female, while the male provides food.

Periodo di involo

35-42 days after hatching. Young remain dependent on parents for several weeks after fledging.

Cure parentali

Both parents care for the young. The female incubates and broods, while the male hunts and brings food to the nest. After hatching, both parents feed the chicks.

Dove trovarlo

Consigli sul campo

1. Stealth and Patience. Goshawks are very secretive. Move slowly and quietly through suitable habitat. Patience is key, as they can be elusive.
2. Listen for Calls. During the breeding season (spring/early summer), listen for their distinctive 'kek-kek-kek' calls, which can indicate a nearby nest.
3. Look for Signs. Look for signs of raptor activity, such as plucking posts (where they pluck feathers from prey) or whitewash (droppings) under potential perches or nest trees.
4. Scan the Canopy. Scan the upper canopy of tall trees for perched birds, especially in the early morning or late afternoon.
5. Respect Nesting Areas. If you suspect a nest, maintain a respectful distance to avoid disturbing these sensitive birds. They can be very aggressive in defense of their young.

Specie simili

Fatti rapidi

Diet:

Birds and small to medium-sized mammals

Habitat:

Dense, mature forests

Hunting Style:

Ambush predator, agile pursuit through cover

Sexual Dimorphism:

Females significantly larger than males

Conservation Status:

Least Concern (globally)

Curiosità

• The name 'Goshawk' comes from 'goose hawk', reflecting its ability to hunt large birds.
• Northern Goshawks are renowned for their ferocity and courage, often referred to as 'phantom of the forest' due to their elusive nature.
• They are one of the most highly prized birds in falconry, particularly for hunting in wooded areas.
• Their bright red eyes in adults are a striking feature and are thought to intensify with age.
• Goshawks are known to build multiple nests within their territory, often alternating between them in different years.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Accipitriformes

Famiglia

Accipitridae

Genere

Accipiter

Specie

Accipiter gentilis

Esplora Northern Goshawk