Now I know that the flock is able to eat crushed oyster shells but what about crab and clams? My parents do an awful lot of crabbing and clamming and end up with all these leftover shells.. If crushed can the flock eat those as well? And what is the take on Lobster shells? I don't even know what the benefits would be for any of that. And if so.. whats is the best method to crush these items?