I never let a carcass go to waste. Beef bones, either. I sometimes by beef neck bones at a local grocer to make my beef bone broth from.
Maybe related, I sometimes like to use lard for cooking. I have a difficult time finding lard these days that has not be hydrogenated or contains additives. I just put it back on the shelf. The other day at Walmart the only organic unhydrogenated lard they had was in a pint jar…… for $13!