The big Eagle question

Hope someone has the contacts to follow up Mark W's suggestion about the "eagle". It reminds me of a day, some years ago, when I was thrilled to see an adult Golden Eagle soaring over Craig Talfynydd. Whilst admiring the spectacle through binoculars a Harris Hawk flew through the field of view. It turned out that a rally of falconers was being held over Mynedd Preseli!