Assertion: tortoise | /r/HasAspect | a high calcium requirement
Facets:
Source sentences:
text: Tortoises have a high calcium requirement: occasionally sprinkle the food with calcium carbonate (WITHOUT phosphorus as this binds calcium making it unavailable for bone/shell growth), or offer an always available calcium-rich source such as boiled chicken eggshells or cuttlefish bone (preferred - always remove hard, thin outer layer to prevent choking) for them to eat.