Gardeners can support wild birds affordably by scattering crushed eggshells on bird tables throughout March. These shells deliver essential calcium that strengthens eggshells for breeding females.
Calcium Boost for Spring Nesting
Birds shift dietary needs with seasons. High-fat seeds sustain them through winter chills, but spring demands calcium for egg production. Maureen Eiger, director of Help Wild Birds, explains: “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 rely on this mineral to form robust eggs, improving hatch rates and chick survival. Popular species like blue tits, sparrows, blackbirds, chaffinches, and robins thrive with this supplement.
Safe Preparation Prevents Risks
Raw eggshells harbor bacteria such as salmonella, posing threats to birds and chicks. Pests like rats may also appear if residue lingers. Sterilize shells first to ensure safety.
Step-by-Step Guide
- Collect: Store empty shells in their carton after cooking eggs.
- Clean: Rinse under hot tap water to remove yolk—no soap, as it harms birds.
- Bake: Spread on a tray and oven-dry at 120°C for 10 minutes.
- Cool and Crush: Let cool until brittle, then grind into fine grit like sand or gravel. Avoid large pieces to prevent choking or nest-raiding behavior.
Scatter the powder on bird tables or around the garden. This simple step attracts more feathered visitors and aids fledglings’ early development.
