Pigs even eat pork. There is currently a problem with swine fever infected pork being reintroduced as feed in places like china. It is one of several vectors for the lethal (to pigs) disease.
Well to be fair, if you were served some nameless meat, would you be confident in your ability to identify human and/ or not like the taste of it?
Chickens will eat egg shells, and it's apparently a good source of minerals for them. You do have to scrunch them up, or else, from what I understand, they start associating egg shells with food, and start pecking their own eggs.