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En Hen Harrier The hen harrier in England working today for nature tomorrow The hen harrier in England The hen harrier is one of History England’s most spectacular The hen harrier was once a widespread birds of prey and it is an and fairly common bird in Britain and there are breeding records from unforgettable sight to watch many English counties from the early this bird floating effortlessly, part of the 19th century. Numbers declined as a result of changes in low over the ground, in search habitat, for example the drainage of prey. Unfortunately, the and cultivation of marshes and heathland, and because of persecution opportunity to see the hen by those seeking to protect poultry harrier on its moorland breeding or gamebirds. By the end of the 19th century the hen harrier had haunts has become all too rare been lost from mainland Britain and in recent years and there is now only a small population survived in the Hebrides off western Scotland a very real danger that it will and on Orkney. be lost as a breeding bird in After the Second World War the hen England. English Nature has harrier started to make a comeback, probably due to a reduction in the launched the Hen Harrier number of active gamekeepers and a Recovery Project to monitor corresponding drop in the intensity of persecution. Northern England was the remaining breeding birds, recolonised in the mid-1960s and in assess the factors responsible the 1970s and 1980s up to 25 nesting attempts were made each year in for the recent decline and help Cumbria, Derbyshire, Durham, begin the process of restoring Lancashire, Northumberland and Yorkshire. It was hoped that this its fortunes. was just the start of a more complete recovery but this was not to be. The population did not increase 2 Nestlings are delicately fed small pieces of flesh by the female until they are old enough to tear prey apart for themselves. Laurie Campbell / NHPA further and, to the contrary, from the In parts of Europe, including mid-1990s there has been a significant northern France, hen harriers still decline in the bird’s fortunes. breed successfully in arable crops although the nests often require Habitat requirements human intervention to prevent the chicks being killed by machinery as In the past, hen harriers bred in the crop is harvested. In Britain, many areas of Britain, and nests although both marsh harriers and were sited in crop fields, marshes Montagu’s harriers breed successfully and heathland in the lowlands, as in fields of crops, the hen harrier is well as on the remote upland now restricted to moorland in the moorlands that provide the main breeding season and occurs on breeding habitat today. lowland farmland only in winter. The hen harrier in England 3 Successful hen harrier breeding attempts in England 15 10 5 Breeding attempts 0 1994 1995 1996 1997 1998 1999 2000 2001 Year The breeding season the ground on folded wings. Some males are polygynous and may be Most hen harriers arrive back on their paired’ to as many as six different breeding grounds in March or April females in extreme cases. The hen and the males soon begin to indulge harrier has a strong association with in spectacular, aerobatic display heather in England and nests are almost flights in order to attract a female. always sited so that the surrounding Aerial displays between paired birds heather bushes provide cover and include turning over in flight with protection. A clutch of 4-6 eggs is laid, talons outstretched, rapid, roller-coaster usually in May, and incubated mainly chases and dramatic stoops towards by the female for about 30 days. In flight the hen harrier holds its wings in a shallow ‘V’ giving it a distinctive profile as it quarters low over the ground. Richard Brooks / FLPA 4 Eggs hatch at regular intervals so there is a substantial size difference between the chicks in a nest. In years when food is short only the largest chicks may survive. Martin Withers / FLPA The chicks spend 30-40 days in the feet, just after it has been dropped nest and are dependent on food from above by the male. brought in by the adult birds until they have learnt to hunt for Although the hen harrier takes a wide themselves. The male does the range of different prey species, the diet majority of the hunting and transfers in the breeding season is dominated food to the female at the nest in a by small birds and mammals. Voles breathtaking display of agility known and meadow pipits are important, as the food-pass. This involves the particularly early in the breeding female flying up from the nest and season, and skylarks, gamebirds and snatching the prey in mid-air with her wader chicks are also taken regularly. The hen harrier in England 5 Winter The English population is boosted in winter by variable numbers of A small number of hen harriers immigrants from northern and remain on the moors outside the central Europe and, in some years, breeding season, but most move the population is thought to be as south to spend the winter in high as 750 birds. Communal roosts lowland areas within England or often form and up to 20 birds may further south on mainland Europe. gather together to spend the night Flat landscapes with wide expanses resting on the ground, concealed of unbroken wetland, farmland from potential predators within a or heath are favoured as they reedbed or other rank vegetation. provide ideal conditions for the bird’s long foraging flights, low over the ground. As with many birds of prey the male hen harrier is somewhat smaller than the female and tends to hunt for smaller prey species. RSPB Images 6 The male hen harrier is pale grey, giving it an almost ghostly appearance as it floats silently over the moors. RSPB Images Conflicts with grouse shooting The situation in northern England is very different. Only very small It is well-known that hen harriers feed numbers of hen harriers are present on both young and adult grouse during and breeding densities are currently the breeding season and, as a result, far too low to have any significant the bird is unpopular with grouse impact on grouse numbers. moor owners and game keepers. As breeding hen harriers have Studies in Scotland have confirmed been absent or present in only that in certain situations, high densities very low numbers in England of breeding hen harrierscan limit red during the 20th century, they have grouse populations and reduce the clearly played no role in the decline number of birds available for shooting. in grouse bags seen in some areas. The hen harrier in England 7 Although there are large tracts of apparently suitable breeding habitat in England, the hen harrier is severely limited by illegal persecution. Andy Brown / English Nature. 8 Despite this, illegal persecution carried out primarily on moorland managed for grouse shooting is thought to be the main factor limiting the hen harrier breeding population in England. It has been estimated by the Game Conservancy Trust that there is sufficient moorland habitat in England to support about 230 pairs of hen harriers. There are, however, only two small areas in England where hen harriers have bred regularly in recent years, Bowland Fells in Lancashire and the Geltsdale area straddling the Cumbria/Northumberland border. In 2000, these areas supported only five successful pairs and, in 2001, the situation deteriorated further. A small number of pairs bred at Bowland but none at all were found at Geltsdale. It is clear that urgent action is required in order to save the hen harrier from becoming extinct in England for the second time in its history. The Hen Harrier Recovery Project English Nature has launched a three-year project, starting in spring 2002, to monitor the remaining hen harriers on their northern England breeding grounds and try to identify the reasons why numbers are currently so low. The hen harrier in England 9 Although persecution is thought to be so that their movements can be the main factor limiting hen harrier followed remotely by radio-tracking. numbers in England as a whole, This technique has been used with other factors such as the suitability great success on other birds of prey of local habitats and food availability in England and should help to reveal may also be significant in some information about survival rates, areas. Before we can start to tackle ranging behaviour and dispersal the problems currently faced by the patterns. Radio-tracking will be hen harrier in England it is important especially useful for locating dead that we have a good understanding birds, allowing them to be recovered of all the factors involved and their quickly so that the cause of death relative importance. can be established. A project coordinator and four This project aims to provide a seasonal fieldworkers will spend starting point for an upturn in the as much time as possible on the fortunes of the beleaguered English moorland breeding areas around hen harrier and, given the current Bowland and Geltsdale. Landowners state of the hen harrier population, in these two areas have been contacted even a small rise in numbers would and we have sought their permission be welcome. to carry out fieldwork on private estates where monitoring effort is currently low. Fieldworkers will log Contacts every hen harrier seen and record details such as age, sex, behaviour Richard Saunders is English Nature’s and habitat choice. Evidence Hen Harrier Project Coordinator, suggesting that a pair has settled to based at our Cumbria Team office, breed will be followed up and, once Juniper House, identified, nest sites will be monitored Murley Moss, closely throughout the breeding Oxenholme Road, season until the young have fledged.
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