This veritable marine treasure trove of a book is richly illustrated by the author, with fifty of the most beautiful, easily encountered, and sometimes astonishing marine organisms found on British coasts, from seemingly exotic seahorses and starfish, to peculiar sea-potatoes and sea lemons. Together, these characterful critters paint a colourful picture of life between the tides: starfish that, upon losing an arm, can grow a new one; baby sharks hatching from their fancifully named 'mermaid' purses'; ethereal moon jellyfish pulsating in the current and, on some seabeds, even coral. Beachcombing, overturning a boulder or simply parting the strands of seaweed in a rock pool offer a glimpse into a thriving underwater world of curious creatures. Inspired by the Oxford University of Natural History's exceptionally rich zoology collections, which contain millions of specimens amassed from centuries of expeditions, this book tells the story of life on the seashore.