An engaging and beautifully illustrated introduction to some of the world's most interesting and charismatic marine creatures. Dive deep into the fascinating world of cephalopods -- octopuses, squid, cuttlefish, and the mysterious nautilus -- to discover the astonishing diversity of this unique group of intelligent invertebrates and their many roles in the marine ecosystem. Organised by marine habitat, this book features an extraordinary range of these clever and colourful creatures from around the world and explores their life cycles, behaviour, adaptations, ecology, links to humans, and much more. With stunning photographs and illustrations as well as profiles of selected species, The Lives of Octopuses and Their Relatives is a comprehensive, authoritative, and inviting introduction to the natural history of these charismatic creatures.