The Johnston & Jeff Dried Calciworms contain around 50 times more calcium than other insects or worms, making them an excellent supplement to the premium quality wild bird feed. Calcium is crucial for maintaining a strong skeletal system, egg development, muscle contraction, nerve impulses, and a host of other vital metabolic systems. Also, this bird food helps in the absorption of phosphorus, another essential mineral for the birds in your garden, and it is high in protein and fat, making it a nutritious and palatable option. This feed should be fed all year round, particularly in winter and spring, during nesting season. Suitable for a variety of bird species such as Blackbirds, Robins, Blue Tits and more. Plus, this fantastic food is perfect for giving birds the nutrients they need and keeps them coming back for more. Quantity: 1.6kg. Please note: Read all the pack contents and other given advice on the packaging carefully.