Not sure what happened here, but it was rather windy that day and I suspect it got caught up in a gust that threw it momentarily off-balance. In any regards, it gave me a great look at the wing pattern that these guys keep mostly tucked in as they graze on grasses.
Canon 7DII + 500mm f/4 II + 1.4TC III, manual exposure, evaluative metering, 1/500s., f/5.6, ISO 800, natural light, handheld, small crop to help the comp, cloned out part of a dark tree trunk creeping in at upper left edge.