England's only resident golden eagle is looking for a new mate - 10 years after his last one disappeared.
The bird has occupied a site at Riggindale Valley, near Haweswater in the Lake District, since 2001.
The bird has been seen "sky dancing" - a series of dives and rises aimed at attracting a mate.
Dave Shackleton, an RSPB warden, said the eagle's best hope of finding a new partner would be a female "drifting down from southern Scotland".
Mr Shackleton added: "He will perch high up in a prominent area in the valley and launch himself and do a series of stoops and rises - a bit like a giant bat.