Bell-shelled Tortoise and Doubloon Barnacles
Barnacles on the tortoise's shell can only grow when specific metallic nutritional requirements are met - Which isn't difficult for bell-shelled tortoises. They are rare because of poaching.
See Also
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Barnacles on the tortoise's shell can only grow when specific metallic nutritional requirements are met - Which isn't difficult for bell-shelled tortoises. They are rare because of poaching.