Is this normal for a bone?

[Capone]

It almost looks carved at the top where the joint would be. Carved for some kind of tool? Probably a stretch but thought I'd check.

 

[Salty]

Rodents of all kinds gnaw on bones, including rats, mice and other critters for calcium. Someone might have wanted a snack! Sometimes bones also start to deteriorate on their own and become more "porous" appearing. This might be the case. Cool you posted this. 😁

 

[CRUSADER]

Looks to be a cattle bone to me.

 

[patiodadio]

Deer bone ?