BIRDS are disappearing from the moors around Huddersfield.
The twite, the ring ouzel and the meadow pipit are vanishing, says a survey out today.
But there is some good news, with increases in the numbers of birds such as curlews and whinchats.
The figures are unveiled in the largest bird survey ever conducted in the British uplands, which includes the South Pennines.
The RSPB charity and English Nature have carried out the survey.
The Repeat Upland Bird Survey counted bird numbers in 13 upland areas of Britain, from Exmoor to the Outer Hebrides.
It found evidence of large falls in several key species.
The survey compared bird numbers from surveys carried out in the 1980s and early 1990s and again in 2000-2002.
Roy Taylor, RSPB conservation manager, said: "Britain's uplands support important populations of several species of conservation concern.
"The overall picture is of many birds ebbing away from our uplands.
"The dramatic decline in twite - which have decreased in a horrifying 80% of areas surveyed - is just one example.
"These birds have their English breeding stronghold in the South Pennines and their demise should be of great concern to anyone who knows these special areas."
Dunlins declined in 59% of the South Pennines sites surveyed, meadow pipits in 29%, wheatears in 46%; twites in 80% and ring ouzels in 64%
In contrast, the curlew increased in 108% of South Pennine sites, with whinchats increasing in 136%.
There are several apparent reasons for the declines. These include climate change, grazing pressure, acid rain, more predators and loss of heather moorland.
* Golden plover: At least 11% of sites containing these birds showed a decline.
* Lapwing: At least 56% of areas showed a decline.
* Dunlin: Numbers in the South Pennines down by 59%.
* Curlew: Half the areas showed a decline but in the South Pennines, there was a 108% increase.
* Skylark: Declining in a third of the areas surveyed.
* Meadow pipit: A 29% fall in the South Pennines, plus falls in 40% of other areas.
* Whinchat: A 136% increase in the South Pennines, but declines in some areas.
* Ring ouzel: At least 75% of areas showed a significant decline. They included South Scotland (77% decline) and the South Pennines (64% decline).
* Twite: All areas showed declines. Significant trends were noted in the South Pennines (80% fall) and North Staffordshire (down 33%).