Less widely known than their cephalopod cousins the octopus and squid, cuttlefish are masters of disguise. They conceal themselves using chromatophores, which are specialized skin cells that hold pigment and reflect light. With up to 200 of these cells per square millimeter, cuttlefish can transform their appearance with a variety of hues and patterns. When vying for a mate, for example, some male cuttlefish will showcase “intense zebra displays,” creating an almost hypnotic pattern of animated stripes. Cuttlefish also boast one of the largest brain-to-body size ratios of any invertebrate. According to some scientists studying cephalopod learning, cuttlefish can use visual clues to solve mazes, making them more intelligent than many vertebrates and land mammals. Photo: Peter Hellberg
I like cephalopods, and think they are very interesting creatures. I hope they continue being very intelligent and awesome. I also hope they manage to somehow break past their two-year limited lifespan. I believe in you, cephalopods.
FEEDING! The chambered Nautilus is a mollusk, related to the octopus, squid, clam and snail. A nautilus, along with the cuttlefish, squid, and octopus, are all cephalopods, meaning “head-foot,” so named because the feet (tentacles) are attached to the head.
The nautilus is the only cephalopod that has a fully developed shell for protection. The nautilus has more than 90 suckerless tentacles. Grooves and ridges on the tentacles are used to grip prey and deliver food to a crushing, parrot-like beak.
This fascinating animal is now on the list of protected species. Quite rightly of course. Of all the squid-species the “Chambered Nautilus” is the only one with a beautiful outer shell. This shell is used for jewelry which is a popular souvenir for tourists. The Nautilus lives at great depth (200 m) but must go to the surface to eat. This makes it extremely vulnerable to its main predator: humans.