Montagu's Harrier male on a cropped rapeseed field (Circus pygargus.)

Spotted this bird of prey during ride through fields after harvest. They were a pair and sitting on the ground in a hunt for mouses.

Full Flickr version:

Canon 6D, Canon EF 100-400L ƒ4.5-5.6 IS USM, at 400mm, ISO100, 1/500, ƒ/7.1