SUPA DRIED CALCI-WORMS 1L or 3 Litres : Wild Bird Food Treats Calciworms Calcium Supa - Dried Calci-Worms 1L or 3 Litres 100% Natural Feed, High in Calcium & Protein Levels Supa Dried Calci-Worms are a 100% natural highly nutritious protein rich treat for Wild Birds that will attract birds to your garden all year round.