Meet Grimpy! He's a dumbo octopus, and he's taking us on a tour of the whole cephalopod class--underwater creatures such as cuttlefish, nautiluses, octopuses, and squids.Grimpy knows all about what makes these many-armed marvels so special, like how the coconut octopus uses tools or the cuttlefish talks with color! It seems like every creature has a special ability--except him. When Grimpy gets stuck on everything a dumbo octopus can't do, the other cephalopods show him why it's great to be a dumbo.