You guys have already figured it out, but those pics are definitely a vulture. It's easy to tell vulture silhouettes apart from other raptors, in part because they look almost like they have no head.
I have them over my property nearly every day, because I live along a ridge line with good updrafts. There are often ten or more riding the thermals here.
I have them over my property nearly every day, because I live along a ridge line with good updrafts. There are often ten or more riding the thermals here.