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Bryozoan colony. Wiki Commons/GNU

[edit] Moss Animals

Number of Living Species: 5,000, mostly marine.

Common Characteristics: Tiny, sessile, colonial animals; form large, variable colonies that may be branching or meshlike.

Noteworthy Behaviors: colonize hard substrates like rock, coral, sand, and mangrove roots; individuals are not interconnected, but typically react to external stimuli simultaneously, retracting into their cases as one.

From: Reef Life by Denise Nielsen Tackett