I blinked to clear my foggy morning eyes. Yup...a turkey leg in my flower patch! What a shock as I checked my seedlings! Nothing around it was disturbed. Did it fall out of some raptor's beak as it flew overhead, or was it the victim of a coyote or bobcat, which do exist around here? How did it get there? What happened to the rest of the bird?
I'm sure it fell in from a parallel world! Wow, sure is a strange discovery ... I would guess the same as you did, a passing raptor dropped it ... At least something had a great meal ... eh, it's the law of nature!