From the giant squid to microscopic squid babies, squids are beautiful and fascinating. As cephalopods, the same family as octopuses and cuttlefish, they have no bones, and swim head-first through the water with their 8 arms (and a pair of tentacles, in some species) trailing behind them. Some squids are brilliantly colored, with the ability to change the color of their skin to communicate, attract a mate, or defend against predators using chromatophores. They swim by jet propulsion, shooting seawater from a funnel, and some squids can even fly out of the water! Click through this slideshow of underwater photos of squids to see some of their stunning diversity.