Back in April, I spotted a Grey Squirrel gnawing on a bone not so far from here.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
Interesting, are they looking for calcium, or just trimming the teeth? I sometimes see sparrows trying to pick out mortar from in between bricks, seems also strange.
It may be a combination of teeth-trimming and calcium-intake. Deer antlers, for instance, are quickly recycled. This is so common it evidently gets in the way of forensics sciences https://www.bu.edu/articles/2016/squirrel-bone-gnawing/
Re: the sparrows, some birds swallow small stones that act as grinding stones in the gizzard, helpful for bearing down hard seeds.
must need some calcium