My backyard is full of bones. And every single one has a spray of little footprints around it. Not from the dog, who has removed every molecule of marrow-y goodness she can, but from flickers. Those long pointy beaks are good bone-cleaners.
I wonder why, as birds who get most of their sustenance from bugs, they don't fly south. How many bugs can there be when it's 10 degrees out?
It's interesting that they will seek out the bones in the yard, but I never see them working on road kill. Why is a cow bone OK but dead squirrel not?
Conversely, why do I not have crows mobbing my yard? (And thank goodness I don't.)