harrier

The bog is an important site for biodiversity and is home to the endangered hen harrier.

Aside from curlew, they pose a threat to a number of native species including the Orkney vole, short-eared owl and hen harrier.

They include endangered birds like hen harriers and water voles, which are now the UK's fastest declining mammal.

More than 1,300 protected birds of prey – from hen harriers to golden eagles - have been killed across the UK over the past 15 years, according to the RSPB.

The findings bolster the idea that humans evolved to be hunting harriers, says Daniel Lieberman, an evolutionary biologist at Harvard University.