I'm posting this in general discussion, since it's an "every species of bird" issue.
I've been thinking about this for quite some time now. I used to believe that cuttlefish bones were necessary as a good source of calcium, but I have heard recently that they are actually not a good source of calcium, because the calcium is not easily absorbed from these bones. I've read in a few places that a mineral block offers a better source of calcium. Cuttlefish bones may be good for a bird to chew on, but my guys chew on plenty of other things. It's bugged me for quite some time that I have to give my guys cuttlefish bones, because I don't like the thought of killing all of those cuttlefish. They're beautiful and very intelligent animals. Imagine how many thousands or even millions of them must be killed each year. What a waste if we don't even need them. I'll ask the vet at my next visit. But honestly - if the bones aren't of much use, shouldn't we just stop buying them? Mind you, I wonder where the calcium from the mineral blocks comes from ... Probably cuttlefish.