This has been successfully used for decades to repel Birds of prey in poultry pens, to protect free range hens, dove-cotes, pheasantries and open gardens. The Birds of Prey are frightened by their own reflection when they fly towards the globe.

Raptor Globe

Siting: Place near the Hens, etc., you are protecting. If possible, position midway between them and the perch used by the raptor. Precise positioning details are supplied.
Material: High quality glass with inner silver coating. Fit onto a wooden pole such as a broom handle, for example (not supplied). The cork supplied with this item must be used to form an insulation barrier between the glass and the pole.
Dimensions: ∅ approx. 22 cm.