These colonial polychaetes live inside of sand tubes that they construct by gluing together grains of sand with mucous from their bodies. Their colonies, made up of millions of individuals, create important habitats for other species.

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This polychaete, known as the fireworm, has rows of fine hairs along the sides of its body that act as irritants, easily breaking off into whatever bumps against them and serving as an effective mechanism of defense.

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