sentence: Zooids are very small, highly modified individuals.
sentences_before: A siphonophore is not a single animal. It is a colony of four kinds of zooids.
sentences_after: All the zooids in a colony are genetically identical. These zooids are specialized polyps and medusoids. Grzimek's Animal life encyclopaedia'.
concept_name: zooid
headings: Siphonophore
categories: Cnidarians