Numbers of the bird of prey may have halved over the last 20 years, say researchers.

The Cairngorms National Park’s peregrine falcon population may have halved over the last two decades, according to new research.

Scottish Raptor Monitoring Scheme carried out its first park-wide survey of the birds of prey last year.

It found the number of breeding pairs had declined by 56% since 2002 with the majority of them failing to successfully fledge chicks.