Product Description: SUPER CAL D-3 for caged birds is an excellent source of Calcium, Vitamin D3 and Magnesium to help maintain healthy bones and a strong skeletal structure. Calcium deficiency is the biggest nutritional problem in bird keeping. It may cause: egg binding, splay legs, nervous behavior, plucking of feathers, poor muscle control and paralysis. This premium formulation is created to promote good laying and hatching of eggs, maintaining strong bones as well as overall well-being of your pet bird.