A behavioral ecologist's riveting account of his decades-long obsession with octopuses: his discoveries, adventures, and new scientific understanding of their behaviors.Of all the creatures of the deep blue, none is as captivating as the octopus. In Many Things Under a Rock, marine biologist David Scheel investigates four major mysteries about these elusive beings. How can we study an animal with perfect camouflage and secretive habitats? How does a soft and boneless creature defeat sharks and eels, while thriving as a predator of the most heavily armored animals in the sea? How do octopus bodies work? And how does a solitary animal form friendships, entice mates, and outwit rivals?Over the course of his twenty-five years studying octopuses, Scheel has witnessed a sea change in what we know and are able to discover about octopus physiology and behavior—even an octopus's inner life. Here he explores amazing new scientific developments,...