That's Bring Your Own Bird. We were watching a group of Caracaras devouring frozen chicken parts that had been put out for them, when this guy flew in from somewhere with his own carry-out meal. It looks like a decapitated black-tailed duck, maybe a Ring-necked Duck or something similar. Shot from a blind on the Martin Ranch, South Texas, last month.
D500, Sigma 150-600 @ 280mm, ISO 800, 1/2500s @ f/7.1 manual.