The Den That Octopus BuiltFollow one of the oceans most mysterious animals in this warm but candid look at its dramatic life cycle, from the creators of The Nest That Wren Built. These are the shells she wears like a sheath, keeping her safe from Tiger Sharks teeth when shes far from the den that Octopus built . . . The solitary and ingenious octopus is a master of disguise and invention, creating her den out of the objects of the ocean, from shells and rocks to tiny glass