Home / Birds The parrot sharpen a beak about a mineral clingstone, and then eats fine slices which from him break away. It not harmful? No, not harmful - all birds require a source of calcium. To limit birds in this plan it is not necessary. In a cage always there should be preparations of calcium, for example, a pounded egg shell or an armour cuttlefish. P.S. Given articles have been translated by the automatic translator