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The tracking technology allows experts at the Roy Dennis Wildlife Foundation and Forestry England to plot exactly where the eagles are re-establishing themselves. Dr Tim Mackrill is a part of the team, and says although the eagle sightings are rare, he's often heard many stories of many appearing in other European cities. He explained: "There's that romantic view of an eagle in the wilderness - but they are on the outskirts of Rotterdam and in Hamburg. There's a pair in Helsinki city centre. "If you went to Germany, Denmark, the Netherlands, it's normal for them to be in these kind of [metropolitan] areas. We're just catching up."