Sea butterflies flit through the ocean on gossamer wings, each species with a style of its own. These tiny marine snails, or thecosomes, migrate up to surface waters at night to feed and sink to ...
The striking purple sea snail (Janthina) found after washing up on a beach in La Jolla, California. (Image: Natural History Museum) A rare purple Janthina sea snail washed up on La Jolla beach, ...
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