Small Pet Select 100% Flaked Oyster Shell Calcium Supplement for Chickens & Ducks helps you support the overall well-being of your birds. Premium oyster shells are a great way to ensure your flock receives calcium and other vital minerals. Calcium is crucial for small animals, contributing to the development and maintenance of strong bones, teeth, and eggshells. Oyster shells are naturally rich in calcium carbonate, providing the ideal calcium-to-phosphorus ratio necessary for healthy skeletal growth and optimal eggshell formation.