The hen harrier population has suffered a decline of 88 pairs (13 per cent) over the past six years with a total UK population estimated to be 545 pairs, according to a survey conducted by Royal Society for the Protection of Birds (RSPB)in the UK.
The numbers are declining everywhere in the UK, with just four breeding pairs left in England and numbers falling from 505 to 460 in Scotland, 46 to 59 in Northern Ireland and 57 to 35 in Wales.
Other pressures such as cold and wet weather conditions over a number of breeding seasons, changes in habitat management and low prey abundance could have all had an impact on numbers throughout the UK.
"The illegal killing of this bird of prey is a significant factor behind the diminishing numbers and a large barrier stopping their recovery," he added.
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