If it was "sitting amongst the buzzards" - that behavior seems to fit with the Caracara (according to the Cornell site). I've never seen one myself...they look pretty cool...
DH and I are half-arsed birders ourselves. I often tell DH to pay attention to behavior. Birds rarely do things "outside" their standard behavior. I wouldn't expect to see an osprey hanging out with buzzards. They have very different niches and habits and food needs. Of course....I never expected to see Osprey nesting at 9'000 feet in the mountains of Colorado, but one does nest near my friends' house there. So....ya never know.....