15 Egg Hacks Every Cook Should Know

5. Eggshells Enchant Birds

Cost: $0* in order to supplement their food with calcium for the nesting season. Give your bird buddies an extra dose of calcium during the nesting season if you have bird feeders. You can add essential calcium for nesting season to your bird feeders by filling them with leftover chicken eggshells, according to the National Audubon Society.

Eggshells are loved by birds. ©Janemf1/Shutterstock Certain birds, like the ubiquitous robin, will not consume the calcium-enriched seeds and suet that you can purchase and use in place of eggshells in your bird feeder. So eggshells are ideal for robins and similar birds.