Plural form; sea anemones or organisms belonging to the group characterized by actinian features, such as radial tentacles and central mouths.
From actinian combined with plural suffix -s; the term groups sea anemones as a collective category of organisms.
Actinians are masters of invisibility in tide pools—they can shrink to almost nothing when exposed to sun and air, then inflate like water balloons when the tide returns, surviving in one of Earth's harshest habitats!
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