Hydrozoa

Rarity: Rare

A topic known well beyond its field, found in many languages.

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At a glance

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What Wikipedia says

Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) 'water' and ζώα (zóa) 'animals'), also called hydroids, are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water.

Excerpt from the Wikipedia article “Hydrozoa”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Seascapeza, CC BY-SA 3.0, via Wikimedia Commons.