One can change its texture and color; the other has structures like teeth in each sucker. Which one is a giant squid, and which one is an octopus? Readers can find out in this engaging look at some of the world's largest and most fascinating sea creatures. With concise anatomy breakdowns, a wealth of detailed information, and an array of impressive underwater photographs, readers become familiar with the similarities and differences between the giant squid and octopus, teaching them to compare and contrast in the natural world.