Male Dunnock on guard duty

There seems to be a number of pairs of Dunnocks nesting in the nearby gardens. The males of which,search for a high spot to seranade their mates.

Nikon D800 + Sigma 150-500 O/S APO,F5-6.3 @ 500mm in DX Mode =750mm.
1/400 sec.@f10 ISO 200