Montagu’s harrier (Circus pygargus) is a slender, long-winged bird of prey that breeds in Europe and western Asia and spends the winter in the open grasslands, crop fields and scrub of the Indian subcontinent. In India it is a regular winter visitor, noticed by its buoyant, low, rocking flight as it quarters the ground in search of small animals. Montagu’s harrier is one of the most graceful raptors a visitor to an Indian grassland is likely to see between October and March.
Montagu’s harrier belongs to the harrier group, hawks that hunt by flying slowly just above the vegetation and listening and looking for prey. The species is named after the English naturalist George Montagu, who described the bird’s habits in the early nineteenth century and helped separate it from the closely related hen harrier. This article explains how to recognise the bird, where it goes in India, what it eats, how it breeds and roosts, and what it needs to survive.
Quick Facts
| Common name | Montagu’s harrier |
|---|---|
| Scientific name | Circus pygargus |
| Family | Accipitridae (hawks, eagles, kites and harriers) |
| Size | About 43 to 47 cm long, with a wingspan of roughly 100 to 120 cm |
| Range and habitat in India | Winter visitor to open grassland, farmland, wetland edges and scrub across much of the country |
| Diet | Small mammals, small birds, lizards, frogs and large insects such as grasshoppers |
| Breeding and migration | Breeds in Europe and western and central Asia on the ground in crops and meadows; migrates south for the winter, reaching India from about September to October |
| Conservation status | Least Concern on the IUCN Red List, though local breeding populations in parts of Europe are vulnerable to farming practices |
Key Takeaways
- Montagu’s harrier is a slim, long-winged raptor of open country that breeds in Europe and western Asia and winters in India and Africa.
- The adult male Montagu’s harrier is pale grey with black wingtips, a black bar across each wing and rusty streaks on the belly; the female is brown with a white patch at the base of the tail.
- In India, Montagu’s harrier is a winter visitor, arriving from about September or October and leaving by March or April.
- Montagu’s harrier hunts by flying low and slowly over grassland and crops, taking small mammals, birds, lizards and large insects.
- Montagu’s harriers gather at night in communal ground roosts in tall grass, which are among the great wildlife sights of Indian winter grasslands.
- The species is rated Least Concern globally, but loss of grassland and changes in farming remain the main threats to harriers in India and elsewhere.
What does Montagu’s harrier look like?
Montagu’s harrier is a slim, small-bodied hawk with unusually long, narrow wings and a long tail, which together give it a light, almost tern-like or gull-like profile in the air. The male and female look quite different, which is typical of harriers and is called sexual dimorphism.
The adult male is the more striking sex. It has a pale blue-grey head, back and chest, a white belly marked with fine rusty-brown streaks along the flanks, and a white rump patch that is less obvious than in some other harriers. The wingtips are black, and a single black bar runs across the folded upper wing. From below, the male shows two dark bars across the underwing and rusty streaks on the underwing coverts, a combination that is the key field mark of the species.
The female is larger and browner. She has dark brown upperparts, a streaked buff underside, a pale facial pattern and a clear white patch at the base of the tail, known as the rump patch. Young birds are similar to females but are warmer, more uniform rufous-brown below with little streaking. A rare dark (melanistic) form also occurs, in which the plumage is sooty black-brown, and these birds are seen occasionally in flocks on migration and in winter.
All harriers share a facial disc, a rough ring of stiff feathers around the face that helps funnel sound to the ears, much as in owls. Montagu’s harrier uses hearing as well as sight to find small prey hidden in thick grass.
How can you tell Montagu’s harrier from other harriers?
Montagu’s harrier is separated from the similar pallid harrier and hen harrier mainly by its wing pattern, its more slender build and its rusty underwing streaking. Several harrier species winter in India, and the males and females of the grey species are easily confused, so careful comparison helps.
| Species | Adult male | Key distinguishing feature |
|---|---|---|
| Montagu’s harrier | Grey with rusty belly streaks and a black wing bar | Black bar on the upper secondaries and two bars on the underwing |
| Pallid harrier | Very pale grey and nearly white below | No black wing bar; a black wedge at the wingtip only |
| Hen harrier | Grey with a solid white belly | Heavier build, broader wings, no wing bar |
| Western marsh harrier | Brown with a grey tail and wings | Heavier and broader; favours reedbeds and marshes |
Females and immatures of Montagu’s and pallid harriers are among the hardest raptors to identify in the field. Experienced observers look at the shape of the pale collar around the neck, the width of the dark patch on the cheek and the pattern of the underwing feathers. The practical tip is to photograph a flying bird and compare it with a reliable field guide.
Where does Montagu’s harrier live in India?
Montagu’s harrier lives in open, low-vegetation habitats across India during the non-breeding season, including natural grasslands, harvested and standing crop fields, scrubby wasteland, coastal plains and the margins of wetlands. The species does not use dense forest.
The bird avoids tall trees and thick woodland because it relies on seeing and hearing prey over open ground. It is recorded across the plains of northern and central India, the Deccan, Gujarat, Rajasthan and the southern peninsula, wherever grain fields and rough grassland remain. It is often scarcer in the extreme northeast and in the dry far north-west during winter.
Within these regions, the number of harriers at any given site depends on food and safe roosting ground. A well-managed grassland with plenty of rodents and grasshoppers can host dozens of harriers, while an intensively farmed field of the same size may host only a few passing birds.
When does Montagu’s harrier arrive in and leave India?
Montagu’s harrier arrives in India in autumn, generally from September to October, and most birds leave again by March or April to return to their breeding grounds. During this period the birds are widely scattered across the subcontinent.
The journey is long. Birds that breed in eastern Europe and western and central Asia travel thousands of kilometres across Central Asia to reach the Indian subcontinent, while western European breeders mostly head to Africa. Satellite tracking of individual birds in recent decades has shown that harriers can cover hundreds of kilometres in a single day when winds are favourable.
Spring departure is gradual. Males often begin moving before females, and in March many Indian grasslands lose their wintering harriers within a few weeks. Late stragglers occasionally linger into April, and some young birds that are not ready to breed may stay longer than adults.
What does Montagu’s harrier eat and how does it hunt?
Montagu’s harrier eats mainly small mammals, small birds, reptiles and large insects, which it catches by gliding slowly just above the ground and dropping onto prey it detects by sight or sound. The species is an opportunist that takes whichever small animal is most abundant.
The typical prey of the Indian winter grassland includes field rodents, gerbils, small ground-nesting birds such as larks and pipits, lizards, frogs and large insects such as grasshoppers and locusts. In Europe, the breeding diet leans heavily on voles and, in some areas, on nestling birds.
The hunting flight is distinctive. The harrier flies a few metres above the grass with its wings held in a shallow V, tilting from side to side, and checks its speed to quarter small areas repeatedly. When it hears or sees movement, it swerves and drops with its legs extended, grabbing the prey with its long legs and sharp talons. The long legs are an adaptation for reaching into dense grass.
- Main method: low, slow quartering flight over open ground.
- Hearing: the facial disc helps locate rustling prey that cannot be seen.
- Prey capture: a short pounce, with the prey usually eaten on the ground.
- Ecological role: helps control rodent and insect numbers in farmland.
Why do Montagu’s harriers gather at communal roosts?
Montagu’s harriers gather in communal roosts at night because sleeping together in tall grass gives the birds some safety from predators and may help them find good feeding areas. The roosts form each evening during the winter and are among the best-known harrier spectacles in India.
At dusk, birds arrive from many directions, often skimming low over the grass, and settle on the ground among grass tussocks. A roost may include Montagu’s harriers alongside pallid harriers, western marsh harriers and, in some places, other raptors. The birds spread out again at dawn to hunt.
The Velavadar grassland in Gujarat, which is protected as a national park for the blackbuck, is widely known for its large winter harrier roost. Other grasslands and coastal plains in Gujarat, Maharashtra, Tamil Nadu and Karnataka also host roosts. Because the roosts depend on tall, undisturbed grass, protecting them means protecting the grassland itself, including seasonal grazing control and the prevention of burning during the winter.
How does Montagu’s harrier breed?
Montagu’s harrier breeds on the ground, building a shallow nest of grass and stems in cereal crops, meadows, heathland or reedbeds, and it does not breed in India. The nesting season takes place in the northern summer, mainly from May to July in Europe and western Asia.
The female usually lays three to five whitish eggs and incubates them for roughly four weeks while the male brings food. A characteristic display is the food pass, in which the male calls and drops prey in mid-air to be caught by the female. The young leave the nest at about four to five weeks of age and fledge soon afterwards.
The species often nests in loose colonies, with several pairs close together. In parts of western Europe, many pairs once nested in fields of winter wheat or barley, and the harvest could destroy nests before the chicks flew. Conservation groups responded by locating nests and protecting them with fencing or by delaying harvest around them, which shows how farming and wildlife can sometimes be reconciled.
What is the conservation status of Montagu’s harrier?
Montagu’s harrier is classified as Least Concern on the IUCN Red List because it has a very wide range and a large global population. This global rating hides local concerns, because breeding populations have declined in several European countries.
The main threats are the loss of natural grassland and wetland edges, the intensification of farming, the destruction of ground nests at harvest, pesticide use that reduces prey and, in some regions, illegal shooting during migration. In India the issues for wintering harriers are the conversion of grassland to cropland and plantations, disturbance at roosts, the burning of grass and the loss of rodent and insect prey through heavy pesticide use.
Birds of prey are protected in India under the Wildlife (Protection) Act, 1972, so hunting or capturing them is illegal. Practical protection, however, depends on keeping open habitats such as grassland, scrub and traditional mixed farming landscapes, which often receive less attention than forests.
Where can you watch Montagu’s harrier in India?
The best places to see Montagu’s harrier in India are protected grasslands and open coastal or farmland areas during the winter months, particularly at dusk when birds come to roost. Velavadar in Gujarat is a classic site, and Point Calimere on the Tamil Nadu coast is another well-known winter raptor location.
- Best season: November to February, when numbers peak.
- Best time of day: late afternoon through dusk, and early morning before the birds disperse.
- What to carry: binoculars, a field guide and a camera with a long lens.
- How to behave: stay at a distance, avoid walking into roost grass, and never flush birds deliberately.
Open farmland with fallow fields and rough grass, even outside protected areas, can also produce sightings. A bird flying very low with a rocking, tilting flight and a white rump patch is a good first clue that a harrier is nearby.
Bottom Line
Montagu’s harrier is a graceful long-distance migrant that depends on open country on both ends of its journey. Protecting Indian grasslands and their communal roosts is the most useful way to keep this elegant raptor, and many other grassland species, wintering in the country.
Frequently Asked Questions
Is Montagu’s harrier found in India all year?
No, Montagu’s harrier is only a winter visitor to India. It arrives from about September to October and leaves by March or April to breed in Europe and western and central Asia. It does not nest on Indian soil.
How can you identify a male Montagu’s harrier?
A male Montagu’s harrier is identified by its pale grey plumage, black wingtips, a single black bar across the upper wing and rusty streaks on its belly and underwing. Its slender build and long wings help separate it from larger harriers. The two underwing bars distinguish it from the male pallid harrier, which has none.
What does Montagu’s harrier eat?
Montagu’s harrier eats mainly small mammals, small birds, lizards, frogs and large insects such as grasshoppers. It hunts by flying low over grassland and crops and pouncing on prey it sees or hears. The species takes whatever small animal is most abundant.
Why do harriers roost together in grasslands?
Harriers roost together in grasslands because group roosting offers some protection from predators and keeps the birds near good hunting areas. Birds arrive at dusk and settle on the ground in tall grass. Velavadar in Gujarat is one of the best-known Indian roost sites.
Is Montagu’s harrier endangered?
No, Montagu’s harrier is rated Least Concern on the IUCN Red List because it has a very large range and population. However, local breeding populations in parts of Europe have declined because of farming practices and habitat loss. In India, the main concern is the loss of open grassland.
Where is the best place to see Montagu’s harrier in India?
The best places to see Montagu’s harrier in India are winter grasslands and coastal plains such as Velavadar in Gujarat and Point Calimere in Tamil Nadu. Visit between November and February, and watch around dusk when birds gather to roost. Open farmland can also give good views.
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