Rocks and boulders provide a hard substrate upon which marine organisms can colonise and grow, additionally when the tide is out they act as refugees by providing shade and shelter.
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Common limpets (Pattella vulgata) congregate in the shade of boulder overhangs
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Look beneath boulder overhangs, in crevices and on the undersides of small boulders to observe the under-boulder communities comprised of fishes, molluscs, crustaceans, cnidarians, sponges, bryozoans and polychaetes worms.
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| Under-boulder community |
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| Green shore crab (Carcinus maenas) found under a boulder |
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| Blenny (Lipophyrys pholis) found under a boulder |
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