Gardeners can support wild birds affordably by scattering crushed eggshells on bird tables throughout March. These shells deliver vital calcium that strengthens eggshells for breeding females, improving chick survival rates.
Essential Calcium Boost for Spring Nesting
Birds require seasonal nutrition shifts. High-fat seeds sustain them through winter cold, but spring demands calcium-rich supplements. Maureen Eiger, director of Help Wild Birds, notes: “We throw eggshells in the garbage almost every day, but they are full of calcium and minerals. Birds need additional calcium, especially after nesting season.”
Females benefit most as crushed eggshells fortify egg formation, ensuring robust shells and healthy hatches.
Safe Preparation Steps to Avoid Risks
Raw eggshells harbor bacteria like salmonella, posing threats to birds and chicks. Sterilize them first to eliminate hazards.
- Collect empty shells in their carton after cooking eggs.
- Rinse thoroughly with hot water to remove yolk residue, which attracts rats—avoid soap to protect birds.
- Spread on a baking tray and oven-bake at 120°C for 10 minutes.
- Cool completely until brittle, then crush into fine grit resembling sand or gravel.
Skip large chunks; birds struggle to handle them and risk choking. Finely ground pieces also prevent birds from mistaking them for whole eggs and raiding nests.
Attract Popular Garden Visitors
Simply sprinkle the grit on bird tables or garden ground. Blue tits, sparrows, blackbirds, chaffinches, and robins thrive on this boost, drawing more activity to yards this March.
