A wild bird deciding whether to land on a feeder is weighing risk against reward in about a second, and what tips that decision is usually whatever is already sitting there. A reliable, high-value feed is what keeps a garden on a bird's regular route.

Johnston & Jeff's dried calciworms are a complementary feedstuff for wild birds, sold in a 100G pack and can be fed ad lib. The maker's own typical analysis quotes 40% protein, 35% fat and 3% calcium, and the calcium content is specifically aimed at helping with egg production and skeletal growth in the birds that eat them.

• 100g, 500g, 1kg or 12.55kg pack
• Typical analysis: 40% protein, 35% fat, 3% calcium
• Can be fed ad lib, as needed
• Store in a cool, dry place below 14°C
• A complementary feedstuff, not a sole diet

On the figures. the listing gives two slightly different breakdowns of the analysis for this product, and we've quoted the manufacturer's stated "typical analysis" figures above rather than pick between them. Not intended for human consumption, and not a complete diet on its own.

Who it's for: garden bird feeders who already offer mealworms and want a calcium-rich alternative, particularly useful during the breeding season when birds are laying eggs and raising chicks.