A bird of the upland fringe
Black grouse are birds of edge habitats. They like, in particular, the transition zone between northern forest and moorland heath. In this habitat they can shelter in the forest in the worst winter weather, feed on tree buds in spring and, in summer, they can nest on open ground and forage with their chicks among the grasses and heathland shrubs.

The black grouse has a spectacular communal breeding system. At dawn in spring, males (blackcock) congregate on traditional display grounds (referred to as a lek). Here they stake out small patches of ground on to which they entice females for mating.

Females (greyhens) are cryptically coloured in mottle brown and lay their eggs in thick ground vegetation within a kilometre or so of the lek. After hatching they take their broods to feed among the tall grasses, rushes and heathland shrubs where they feed first on insects then buds, flowers and seeds.

Black grouse nutrition

The staple foods of black grouse are heather and bilberry, but black grouse like buds, leaves, flowers, seeds, stems and even the spore capsules of mosses and twigs of several trees.

Most black grouse chicks hatch in mid-June and they remain as a family covey until September. Young males tend to reside close to the home lek whereas females often disperse several kilometres to other areas of suitable habitat where there are other populations of black grouse.

The decline of black grouse

The last estimate of black grouse numbers in Britain was 5,000 displaying males in 2005, with the population centred on a few key upland areas of Scotland, northern England and Wales. 150 years ago black grouse were more numerous and widespread and they could be found on many heaths of southern and eastern England. The decline and contraction of range seems to have begun about a century ago following gradual improvements in farming.

Most worrying is that in the late 1990s the black grouse was declining at a rate of some 8-10% per year with a geographical range that was continuing to contract.

Today’s continuing loss seems to stem from the following:

  • Loss of habitat mosaic. Land-use used to be mixed. Black grouse favour a patchwork quilt of farmland adjacent to moor and forest, and they need a sweep of suitable countryside to sustain their population. Contiguous areas have been broken up by block forestry and intensive farming.
  • Over-grazing. High densities of sheep and red deer eat out ground cover, thereby reducing the abundance of caterpillars that grouse chicks need.
  • Changes in forestry. Black grouse like the ground cover in young plantations, but as these develop into solid conifer thickets they tend to leave. Forest edge used to melt into heathland through a transition of scattered trees; today’s forests are hard edged.
  • Increased mortality. Because they are now more common, crows foxes, stoats and some birds of prey cause a high annual loss. In addition, forest deer fences kill many birds.

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