Sue Daly / Breadcrumb Sponge (Halichondria panicea) on the seashore, Guernsey, British Channel Islands.

Nick Upton / Green and orange forms of Breadcrumb sponge (Halichodria panicea) growing on rocks exposed on a low spring tide, North Berwick, East Lothian, UK, July.

Nick Upton / Breadcrumb sponge (Halichondria panicea), orange form, exposed at low tide, Gower peninsula, Wales, UK, September

Sue Daly / Breadcrumb Sponge (Halichondria panicea) and other encrusting sponges. Channel Islands, UK, June.

Sue Daly / Breadcrumb Sponge (Halichondria panicea) and other encrusting sponges. Channel Islands, UK, June.

Sue Daly / Breadcrumb Sponge (Halichondria panicea) and other encrusting sponges. Channel Islands, UK, June.

Sue Daly / Breadcrumb Sponge (Halichondria panicea). Channel Islands, UK, July.

Nick Upton / Close up view of Orange form of Breadcrumb sponge (Halichondria panicea) growing on rocks exposed on a low spring tide. Rhossili, The Gower Peninsula, UK, July.

Alex Mustard / Velvet swimming crab (Necora puber) crawling across a bright yellow Breadcrumb sponge (Halichondria panicea) on the wreck of the Rosalie, Weybourne, Norfolk, England, UK, North Sea.

Alex Mustard / Sponge spider crab / Decorator crab (Inachus sp) on Sea vases (Ciona intstinalis). Kinlochbervie, Sutherland, The Highlands, Scotland, United Kingdom. Loch Inchard, The Minch, North East Atlantic Ocea...

Alex Mustard / Sponge spider crab / Decorator crab (Inachus sp) clambers over Sea vases (Ciona intstinalis). Kinlochbervie, Sutherland, The Highlands, Scotland, United Kingdom. Loch Inchard, The Minch, North East At...