The survey showed stonechat numbers are rising on Exmoor
Some of Exmoor's once common birds have become extinct on the moor.
A new survey by the RSPB has revealed an alarming decline in a range of species.
The RSPB found the lapwing is now extinct on Exmoor, as is the red grouse.
It also reported steep declines in species like the whinchat and curlew.
The society said the reason for the fall in numbers was unclear, although it would work with Exmoor National Park authority to try to halt the decline in the birds' numbers.
The survey did also reveal some positive statistics.
It found that stonechat numbers are increasing to the extent that Exmoor now has an internationally important population.
There is also a new arrival on the moor, a healthy population of the rare Dartford warbler.