The cuttlebone is a lightweight, oblong, chalky object that is mainly composed of calcium making it an ideal way to supplement a birds' calcium intake. Cuttlebone is about 85% calcium, so it is an ideal way of increasing your bird's calcium levels. That is if your bird takes any interest in it. Companion birds either take to a cuttlebone or they don't. And there is no way to predict which way your bird is going to go with a cuttlebone. However, they are inexpensive and offering one of these calcium-rich bones