While scouting a local wetlands area, two Common Grackles landed closely together and facing each other, right in front of me. They immediately both held this pose as a threat display towards each other. I was too close to include both birds, even too close for just one, but by going vertical I was able to compose this image closeup of the behaviour. The poses were held for about 20 seconds, most of the time with the nictitating membrane closed, but they would open it from time to time for a good view of the eye.
Canon 7DII + 500mm f/4 II + 1.4TC III, manual exposure, evaluative metering, 1/640s., f/5.6, ISO 1600, natural light, handheld, FF, lightened a some of the darker areas of the BG, and desaturated some of the yellows as well.