Relating to or characteristic of epizoa; describing something that lives or exists on the external surface of an animal.
From 'epizoa' plus the adjectival suffix '-al'. This is a descriptive term used in parasitology and zoology.
Epizoal relationships are surprisingly common in nature—remoras fish attach to sharks, birds pick parasites off mammals—creating a hidden economy of services that keeps animal populations healthy and balanced.
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