MCS logo, two figures in silhouette - a dolphin jumping, superimposed by a diving human, with the slogan 'Seas fit for life'.

MCS: Lancashire area group

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Right: Photograph of the sea slug Janolus cristatus (Delle Chiaje) by Ron Crosby.

Sea slugs are seasonal, but can be quite common. They are usually found feeding on bryozoans or sea firs, but can be hard to spot.

  The body of this sea slug is covered by protruberences (rhinophores).

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